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Nathan HPL #020 2.0 Liter Men's 2-Liter Hydration Race Vest (Flint Grey)
Show more by Nathan
Average Rating: 4.5 star rating (68 Reviews)
List Price: $89.99
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  • 3-way Propulsion Harness; vertically adjustable sternum strap
  • 2 liter hydration bladder with filter-compatible screw-top closure and bite valve
  • Twin front holsters for carbo-gel and/or GPS
  • Two zippered rear compartments and zippered front pocket
  • Weighs 14 ounces; one size fits all
Product Description:
3-way Propulsion Harness; 2 liter hydration bladder with filter-compatible screw-top closure and bite valve; Twin front holsters for carbo-gel and/or GPS; Two zippered rear compartments; Zippered front pocket; Lightweight, breathable Wall Mesh with soft perimeter binding - feels great against skin and won't damage technical apparel; Weight: 6 oz.
Nathan's ultimate trail and ultrarunning hydration vest, the HPL 020 helps you go farther and faster, easier. Even at 50 miles and beyond, the vest remains as lightweight and comfortable as it was at mile one.


Power Stretch Mesh back pocket secures shed jacket or gloves.
Its 3-way Propulsion Harness minimizes bounce, while superior construction reduces chafing and won't damage technical apparel. Carrying fluids for several hours on the go has never been so easy and comfortable. Features include a 2-liter hydration bladder with Slideseal top closure and bite valve, dual front Power Stretch mesh pockets--one zippered--two zippered rear compartments, a shock cord with one-pull tension lock for jacket and gloves, vertically adjustable sternum strap with tube clip, and lightweight, breathable wall mesh with soft perimeter binding.

Features:

  • 3-way Propulsion Harness
  • 2 liter Hydration Bladder with a Slideseal top closure and bite valve
  • Dual front Power Stretch Mesh pockets; one with zipper closure
  • Two zippered rear compartments
  • Shock Cord with one-pull tension lock for jacket or gloves
  • Vertically adjustable sternum strap with tube clip
  • Lightweight, breathable Wall Mesh with soft perimeter binding
  • Weighs 14 ounces
  • Adjustable fit; one size fits all

Customer Reviews:  
Add Your Own Review
5.0 out of 5 stars.  The Best That's Out There, April 20, 2010
By Ken Zemach (Redwood City, CA)
(Now Updated)

I waffled between giving this 4 stars and 5 stars, but ended up with 5 because it really is the best hydration pack (for running) out there. I've now used it for six+ months, putting in 50-70 miles/week, and also three 50 mile races.

However, it isn't perfect, so I'll outline the pros and cons as I see them. Some of this is probably personal opinion so use your own judgment:

Pros:
*lightest weight for the carried volume I could find
*easy to clean for those of us that put drink mixes in bladders
*Pretty good bite valve, although I do recognize that some don't like it
*Nice inventive chest clip that holds the drink tube, back panel securing system, adjustable height chest strap, and some other nice touches. These guys at Nathan did not just assemble a bunch of off the shelf crap to make a product; they creatively invented some stuff to solve real world problems, and for that they are way ahead of the pack (e.g. Camelbak)
*Reasonably good assortment of pockets and well placed too.

Cons:
*After about three months of use my bladder has started to leak many here have complained about it. I like to know my stuff is rock solid and I don't have full confidence in it. I'll replace with an MSR bladder, as those are bomb proof.
*Bladder sealing mechanism takes some time to get used to. With practice, you can open and close really quickly, but others can't, which can kill time at an aid station during a race. It's in your best interest to run into the station with the thing off your back and the slide opened, and close it yourself after they fill it.
*The mesh pocket on the left side (as you're wearing it) needs to be taller and with much tighter elastic along the top; if you're trail running stuff falls out. I'm going to add some velcro or something to allow me to use it as a secure pocket.
*There is better vent mesh out there for the back of this thing, although NO companies I've met use the good stuff (we use it for some of our projects). If they were to use the good stuff, you'd get better back ventilation, although it's not really bad per se. It could just be better. Again, no company uses the good stuff.
*The elastic cinch cord on the back is great for strapping down extra stuff like a lightweight rain jacket or extra layer. However, after doing this (a LOT), it seems to have put some extra stress on the molded rubber V thing at the rear bottom: mine broke. I fixed it by sewing in some webbing instead, and it works fine now, but it did require mending. None of the other reviews mention this, and it happened to me early enough (around 5 months of ~ 50-70 miles/week; that's not much for long distance running) that I think it really is associated with me stuffing extra gear back there which probably means it's not really designed/tested for this.

Summary: Best of the best. Not perfect, but it's the one to buy. Expect to replace the bladder, and don't depend on it for critical runs. Watch out if you shove lots of stuff under the cinch straps on the outside, meaning inspect your rubber molded V at the bottom for unusual wear. Even though my bladder died early, and the V broke (but fixed with regular webbing now), it's STILL leagues above anything else out there. If something better comes along, believe me, I'll buy it and note it here.

33 of 34 people found the above review helpful.

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4.0 out of 5 stars.  20 Mile Run Review, August 3, 2009
By Curtis H. Maxwell
I just received this and went right on my scheduled 20 mile run. The pack when full weights about 6lbs, which takes about 1/2 minute off your pace until you get used to it and begin to drink from the pack. I mixed 70oz of Cytomax with Endurolytes powder. The 70oz was enough for the 20 miles, but you will need to tank up again for full marathon. I would recommend filling up 1/2 for best results of weight vs duration depending on your access to water at 15 mile mark. If none is available this does the trick.

The package:
Lots of room for cell phone, drink mix, gu packs, camera, pair of dry socks. Two side pocket in front for quick access for needed items. It also allows you to change layers and store them on pack, which works for cold mornings that get warmer within a few hours of your run.
Pack stays on back without movement, but you will hear the liquid sloshing. I did not chafe on 20 mile run, and straps did not put pressure on shoulders with a thin tech shirt. This would be best for remote trail runs where you are away from any support (7-11, gas stations, fast food)

The fit:
The front has a clip for the hose. I found that it is adjustable and with a few tries was able to get it to stay put. There are two sliding clips on the front that allow for vest to remain comfortable.

The cleanup:
I mixed a mild bleach solution to clean out and dry. There are two holes at top to hang unit for drying.


28 of 28 people found the above review helpful.

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5.0 out of 5 stars.  The Best That's Out There, April 20, 2010
By Ken Zemach (Redwood City, CA)
(Now Updated)

I waffled between giving this 4 stars and 5 stars, but ended up with 5 because it really is the best hydration pack (for running) out there. I've now used it for six+ months, putting in 50-70 miles/week, and also three 50 mile races.

However, it isn't perfect, so I'll outline the pros and cons as I see them. Some of this is probably personal opinion so use your own judgment:

Pros:
*lightest weight for the carried volume I could find
*easy to clean for those of us that put drink mixes in bladders
*Pretty good bite valve, although I do recognize that some don't like it
*Nice inventive chest clip that holds the drink tube, back panel securing system, adjustable height chest strap, and some other nice touches. These guys at Nathan did not just assemble a bunch of off the shelf crap to make a product; they creatively invented some stuff to solve real world problems, and for that they are way ahead of the pack (e.g. Camelbak)
*Reasonably good assortment of pockets and well placed too.

Cons:
*After about three months of use my bladder has started to leak many here have complained about it. I like to know my stuff is rock solid and I don't have full confidence in it. I'll replace with an MSR bladder, as those are bomb proof.
*Bladder sealing mechanism takes some time to get used to. With practice, you can open and close really quickly, but others can't, which can kill time at an aid station during a race. It's in your best interest to run into the station with the thing off your back and the slide opened, and close it yourself after they fill it.
*The mesh pocket on the left side (as you're wearing it) needs to be taller and with much tighter elastic along the top; if you're trail running stuff falls out. I'm going to add some velcro or something to allow me to use it as a secure pocket.
*There is better vent mesh out there for the back of this thing, although NO companies I've met use the good stuff (we use it for some of our projects). If they were to use the good stuff, you'd get better back ventilation, although it's not really bad per se. It could just be better. Again, no company uses the good stuff.
*The elastic cinch cord on the back is great for strapping down extra stuff like a lightweight rain jacket or extra layer. However, after doing this (a LOT), it seems to have put some extra stress on the molded rubber V thing at the rear bottom: mine broke. I fixed it by sewing in some webbing instead, and it works fine now, but it did require mending. None of the other reviews mention this, and it happened to me early enough (around 5 months of ~ 50-70 miles/week; that's not much for long distance running) that I think it really is associated with me stuffing extra gear back there which probably means it's not really designed/tested for this.

Summary: Best of the best. Not perfect, but it's the one to buy. Expect to replace the bladder, and don't depend on it for critical runs. Watch out if you shove lots of stuff under the cinch straps on the outside, meaning inspect your rubber molded V at the bottom for unusual wear. Even though my bladder died early, and the V broke (but fixed with regular webbing now), it's STILL leagues above anything else out there. If something better comes along, believe me, I'll buy it and note it here.

22 of 23 people found the above review helpful.

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3.0 out of 5 stars.  Hole in the bladder seam, May 16, 2009
By El Bravo (Virginia)
Irony. I just came on line to see how I can get a replacement for the bladder to this vest, and here was an invitation from Amazon to write a review. I bought this vest because of the rave reviews fellow runners have given it. Today was it's maiden voyage, a test, for a planned 15 mile run. One mile into the run I felt water streaming down my back and legs. A hole had opened up in the seam about midway up the bladder. I was with other runners so they shared water for the run. On a positive note, the vest felt comfortable with no jostling up or down like the camelback. Don't know how it will perform with a full bladder. I'll let you know how my request for a replacement goes. The initial lesson, of course, is to test out a new product before launching out on a race or long run.

12 of 12 people found the above review helpful.

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4.0 out of 5 stars.  Trail Runner, May 19, 2009
By Pkg Guy (Chicago)
I've used this product 4 or 5 times now. I like it for running because it doesn't go as far down my back as some made for biking. It is also very light and comfortable. The pouches on the front part of the vest are great for holding car keys, gels, bars, etc. You can get to them without having to remove the vest.
On the downside, the bladder is flimsy and the valve is terrible compared to the Camelback. Most of my friends have replaced the Nathan bladder with the Camelback.
All in all, though, I am pleased with my purchase.

8 of 9 people found the above review helpful.

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3.0 out of 5 stars.  Decent product but needs improvement, September 2, 2010
By Steve (Los Angeles, CA)
I recently used the Nathan HPL in the Angeles Crest 100 trail race. It performed ok, but I was frustrated with several design shortcomings. I have primarily been using a Camelbak Mule for the past 8 years, and although the HPL is probably better for racing in moderate weather, the Camelbak is much more well thought out overall. The Nathan pack is a decent product, but I'd still much prefer running with water bottles. If you need the capacity of a waterpack, the camelbak is probably preferable unless you have moderate distances between aid stations where you don't need to carry much in the way of clothes or cold weather gear. It is really a specialty product that I'd only recommend for limited racing conditions - use waterbottles if the distance is shorter, or a camelbak for more challenging races/training.

Major complaints:
1) Hose clip - Although many people have complained that the bladder is terrible - although it is not of the same caliber as the camelbak's, I found it ok - my chief complaint with the pack was that the hose clip would not keep the hose in place. If the clip was just attached to the hose it would seem to pop out after a couple minutes on rough terrain, and even at the end of the hose where the nozzle comes out it wasn't that much better. It is incredibly frustrating during a race to have the hose bouncing around, and the clip should be a lot stronger and more secure.
2) Hose sleeve - camelbaks and many other packs incorporate a sleeve into the top of the shoulder strap as well as a band on the strap before including a clip. This significantly reduces the bounce that could lead to the hose bouncing off. Even though the HPL is a vest, there could easily be some type of sleeve or more ways to keep the hose from moving around on the vest during use other than the one flimsy piece of material half-way down the strap.
3) Sternum strap is poorly designed and there likely should be two. The sternum strap is quite funny and weird getting used to. I had to cut off the end of the strap and double it back to get it tight enough for use, but it never felt quite right. It seems like there should be a strap higher up on the chest and one lower down towards the bottom of the straps, and I am not clear why there isn't. This would be comparable to a waist strap and sternum strap on many other packs, which helps to minimize bounce.
4) Sloshing in the bladder - Unlike the mule, the HPL doesn't allow you to cinch down on the bladder compartment itself so that there is significantly more sloshing than necessary. I'm not sure why they don't have one of the two sets of straps higher on the pack to keep the bladder more firmly in place and allow the bladder to be kept snug while you drink the fluid.
5) Poorly designed storage. The flimsy straps on the bottom of the pack for a jacket are just terrible. The pack would be much better if there was a larger compressible zipper area that could store a jacket. I hate things flapping around when I'm running and even when you cinch a jacket down it still is way more bulky than it should have to be. A compartment along the lines of what the amphipod waist packs have would be much better. Similarly, it is not good for storing hats or gloves because they are likely to fall off. The additional weight of a large zipper compartment on the back would be minimal and make the pack much more useful for training and carrying warm gear.

Although I have focused on shortcomings, Nathan did do several things to make this a decent product:
1) The compartments on the front of the pack are truly awesome. It is great not to have to take off the pack to get at food and gels and it makes you much more likely to eat more during a race.
2) The location of the bladder on the back is great. The lower position makes it better than a camelbak for running.
3) The material is much nicer for running shirtless than anything else on the market.

If you're going too far to use water bottles, but you don't need to carry a jacket or gloves this is the best product on the market. However, if you need to carry a jacket or gloves - which seems to always be the case for me, I'd say the camelbak is still superior. The camelbak also seems a lot more durable for climbing, biking and other activities. I haven't had any problems yet with the soft material of the HPL vest, but it just seems fragile.

6 of 6 people found the above review helpful.

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5.0 out of 5 stars.  Runner? Hiker? BUY THIS!, May 21, 2010
By Read Ayn Rand. (Rochester, NY)
I run 4-6 times a week and bike or hike randomly. Ive worn backpacks and carried water bottles this entire time...I didn't know what I was missing. Backpacks often bounce around and water bottles always get sweaty or wet. Then, because I want it on me, I needed to carry around my wallet and cell phone which I kept in lunch bags. NO MORE!

This is an amazing work of ergonomic engineering. The straps fit perfectly and comfortably, the hose can be set to either side, the pouches are absolutely appropriately placed. I don't even know I have my cell phone in the front pouch and its not a small one ( ATT TILT 1). the back pocket has enough room for a Garmen 305 GPS and its heart monitor and my wallet, I am sure if I had more stuff to bring I could comfortably fit 2-3x more in there.

The way the bag sets on your back and moves with the natural movement of your body is amazing. Due to the little 3 sided rubber "shock absorber" which allows the straps to extend according to the users movements, this was a GREAT idea.

The front buckle is well designed, each side is attached to a concealed "track" that allows it to slide up and down about 6" or 7" to adjust to the users body. For example: When my wife first tried hers on the straps were up uncomfortably around her chest and she was a bit annoyed. But a few seconds later she was able to slide the straps down along these durable well concealed tracks and have it fit comfortably.

The water bag is literally hung in the bag and fits snuggly (part of its water delivery is due to gravity). It's easy to refill, if a bit awkward, what with the way it hangs on a strap in the inside. I would run a few bags of water through it when you first get it, my wife and I learned the hard way that we would taste plastic the first time since we didn't.

The drinking piece is comfortable and has an attachment place on the front strap so it isn't tossing around when your running. I foresee this wearing down after a time so I would recommend getting some extra parts and maybe a bag just in case, to have on hand. But make no mistake, I do not think this is a problem, just normal wear and tear on less durable parts.

My reccomendation:

If you are a runner and you want a bag that feels like its not even there, BUY THIS. You will not regret it.

5 of 5 people found the above review helpful.

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5.0 out of 5 stars.  Ultra-marathon tested and approved, February 16, 2010
By Devin Brown (Houston, TX United States)
I've had this hydration vest for a bit over a year now. I got it originally so that I could take water and fuel with me on my longer runs without having to carry a bottle. The webbing and design of the harness allows you to fit it to your back and it just sticks there. The added bonus is that the cold water bladder feels really good on your back on hot Texas days. There is no bouncing while running and even after 10+ hours on the trail, I have never had any problems with chafing. I also use it for longer bike rides, although due to the different body position, I tend to leave the chest strap unfastened. This is not an issue anyway since road cycling doesn't cause any real jostling.

The pockets in the front are handy with the zip-up enclosed pocket being a perfect size to put my iPhone in. This pack strikes a good balance between giving adequate storage space and staying small. If I need to get at items in the big back compartment, I can unsling the pack, get what I need, and then throw it back on, all without breaking my stride.

The only problem I have had is that the open/close elbow valve for the water spigot has gotten a bit tough to open. This is an annoyance while running and a downright impossibility while riding. I think I got some debris in it though, so I don't fault the design of the pack. The elbow and valve is modular and easy to remove from the rest of the pack to troubleshoot or even replace if need be.

Over the last year, I have been seeing more and more trail runners switching to Nathan from competitors like Camelbak. I think this is the way to go.

5 of 5 people found the above review helpful.

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5.0 out of 5 stars.  What more could you want?, September 20, 2009
By Jere W. Grube (Manheim, PA USA)
I bought this race vest for my first trail run and it exceeded my expectations. I debated between the 1.5 liter version and this one, but I chose the 2 liter version and I'm glad I did. I ran my first 25 mile trail run a few weeks ago and the vest performed flawlessly. The two liters of water was adequate to get me from one checkpoint to another and there was just enough room for a small first aid (blister) kit, a cell phone, extra socks and energy gels. The vest rides so smoothly I could forget it was there. So much better than a fanny pack hydration system(I tried one before I bought this vest)! It adjusts fairly easily and the straps stay where you set them.

5 of 5 people found the above review helpful.

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5.0 out of 5 stars.  Nathan ROCKS, December 8, 2010
By Slim (California)
I have used for 2 months: the hydration pack is efficient and effective: light weight and easy to use. I have enjoyed every day for one hour workouts as well as one ultra-marathon with no leaks. The newest version is the Amazon version I have spent some time researching and indeed this is the newest version.

One minor challenge when it's freezing cold it is harder to twist the nozzle to the on position...love this product would buy another one today.

Will report back on the 6 month product review.

4 of 4 people found the above review helpful.

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4.0 out of 5 stars.  Great pack, bite-valve needs work, September 10, 2009
By natetron (Nacogdoches, TX)
This review is of the women's model, but the men's model is almost identical, just larger.

Bought this to replace a Camelbak pack for use in 12 hour Adventure Races. The pack blows every Camelbak pack I've seen or used out of the water in terms of adjustability, materials, and comfort. The broad vest material is much lighter and able to wick sweat than the material Camelbak uses. A chest strap slides up and down the front and adjusts the distance between - tightening it as you empty the bladder enables a consistent fit. The rubber "Y" at the base of the pack keeps the pack from swinging from side to side while you run, and from swinging off of your back and then slamming against you as well. The pockets are well placed and allow you to carry essentials. The narrowness is similar to many Camelbak packs and allows your most of your back to breathe, unlike wearing a full-size backpack that can accept a hydration bladder.

The only downsides I've come across are with the bladder. I've read several reviews that mentioned the bladder's seams failing, although I have yet to see this happen. After numerous biking trips, a backpacking trip, and several 10+ mile runs, the seams seem fine to me. The straw is of a large diameter though, and is more stiff than Camelbak straws. This makes it a little unweildy at times. I do not care for the mouth valve. It requires that you bite and pull a cap to allow flow - similar to a beefed up bike water bottle valve. If you don't keep suction on it while you are pulling it open, air will enter the line, which you then have to suck out to get the water - never had that problem with a Camelbak bladder. It is also nearly impossible to squirt water using this mouthpiece (which comes in handy sometimes, trust me).

Love the pack, but am purchasing a 2 Liter Camelbak bladder to replace the Nathan one.

4 of 4 people found the above review helpful.

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4.0 out of 5 stars.  Excellent pack, bladder not so good, May 27, 2009
By J. Hager
I really like the pack. It is comfortable and easy to adjust. It really rides nicely on the back. I have ran hundreds of miles with Camelbaks and I find this pack fits my body better. The bladder is pretty cheap. Three runs in and it is already in the trash. It sprung a leak on my third trail run with it. I replaced the bladder with a Camelbak bladder.

4 of 4 people found the above review helpful.

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4.0 out of 5 stars.  Nathan HPL #020 Hydration Vest Rocks, May 9, 2010
By Ernest W. Chalekson (Manhattan Beach, CA)
I always hated when for a long run, I would have to saddle up with my Camelback. It always made me feel like a mule, hauling an uncomfortable load of water. Those days are gone. The Nathan in extremely comfortable, distributes the weight well and does not bind at all. I find no problem with the mouthpiece on the Nathan bladder. The Nathan bladder does not seem as well-built as the Camelback, but seems adequate. I am extremely happy with this purchase.

3 of 3 people found the above review helpful.

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4.0 out of 5 stars.  Marathon & Half-Marathon Gear, May 2, 2010
By A. Gift For You (Silicon Valley, CA)
Used this for both the Mt Diablo Half-Marathon (cross-country) and Big Sur Full Marathon. Perfect 2.0-liter size for a race with a few aid stations along the way. Didn't notice I was even wearing it while running. Front pockets perfect for GU shots. Was able to fit a Canon Power Shot 4.0 megapixel S400 digital camera in front left pocket during Big Sur Full Marathon; although it occaisionally would 'pop-out'. Forthunately, I tied the camera lanyard to a zipper lanyard, saving the camera during an ejection event. Rear pocket sufficient to hold a wallet and car keys. The closure mechanism for the 2.0-liter hydration bag is peculiar (fold over once, slide a plastic fixture into place) but it worked fine. Likewise the bit-valve shutoff mechanism was difficult to operate (not a turn on/off, rather pull-on/push-off).

3 of 3 people found the above review helpful.

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4.0 out of 5 stars.  Nathan 2.0 pack, April 27, 2010
By Garry Harrington (Colorado Springs)
The Nathan HPL #020 2.0-liter hydration pack seems to be perfect size and weight for use in a 100-mile trail race ... I could maybe use one more pocket or storage area on the back or perhaps on the inside of the pack, but seems to have room for everything I will need to carry during a race. The bladder itself has a sliding lock mechanism at the top which is unwieldy and potentially messy during filling in a race especially when hands are cold and tired; would prefer the conventional bladder system with the screw-off cap for refilling. All in all, though, a good piece of gear to possess.

3 of 3 people found the above review helpful.

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5.0 out of 5 stars.  Simply the best I've tried, March 15, 2010
By D. Brennan (Vancouver, BC)
I've tried various hydration solutions and this is, by far, the best on the market. It's well designed so feels comfortable even when fully loaded. The pockets up front are the perfect size for everything you need for a marathon and there's room in the back for a windcheater. Despite what others have written, I like the valve system, and whilst agree the bladder feels somewhat flimsy, I've had no problems with it so far.

3 of 3 people found the above review helpful.

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5.0 out of 5 stars.  Perfect for point to point marathon, December 23, 2009
By W. Jacobi (Chicago, IL)
I recently completed the Tecumseh Trail Marathon outside of Bloomington, IN. It was the first time I used my Nathan. It was the perfect amount for the race. I ran dry at about mile 25, which was no big deal. Storage pockets are great for gels and such. In the main pocket, I also had a couple of PB&J sandwiches and a couple powerbars.

3 of 3 people found the above review helpful.

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4.0 out of 5 stars.  Good bag, bad bladder, November 11, 2009
By physicistjedi (Cambridge, MA)
The bag itself if very comfortable. I had no chaffing in 2+ hour runs. It is designed for running. Camelbaks I tried felt significantly more bouncy. I've read elsewhere that this model is very popular among ultramarathoners. It also has enough pockets for extra fuel, keys etc.
But the bladder is low quality. It has some plastic taste and it leaked in the middle of a run after about 2 months of use. If you read other reviews, you'll see that it is a very common issue so change the bladder asap. Many 2+ liter Camelbak and Platypus bladders are too long for this bag. I finally bought the 72oz Camelbak bladder which is "low profile" and I am happy with them so far.
Bottomline: Buy the bag, change the bladder, enjoy running.

3 of 3 people found the above review helpful.

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5.0 out of 5 stars.  Leadville Trail 100, Leadville, Colorado, September 27, 2009
By Heather M. Pashley (Evergreen, Colorado United States)
In August 2009 my Son ran and completed the "Leadville Trail 100" held in Leadville,Colorado. He used the Nathan HPl Hydration Race Vest. It was comfortable and met all his requirements His older Brother, who was a pacer for the last 13 miles has just purchased one for himself !

3 of 3 people found the above review helpful.

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5.0 out of 5 stars.  Great design and function, June 19, 2009
By ~BW (MD)
I bought this mainly to take on 20+ miles unsupported, fuel belt wasn't enough unless I wanted to add a few hand-held bottles. Has enough cargo room to pack the essentials, but not too much -- preventing people like me from packing that extra nutrition/stuff I never seem to need.

Running with a pack takes a little getting used too. I've run with a camel back (ridge runner), and this was way more comfortable, lightweight, etc. I think running with a pack affects your running form, just due to the distribution of weight, but I was able to adjust without too many issues.

30 miles is about my limit with the hydration provided by this pack.

3 of 3 people found the above review helpful.

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4.0 out of 5 stars.  Currently the best option out there, August 1, 2011
By Qball (South Portland, ME United States)
Overall, this has been a really great purchase and I would recommend it to anyone doing any type of distance running. Here's a brief run down of my experience with the product so far:

Pros:

Once adjusted properly, the custom fit is excellent. There's no jostling up and down, bunching, chafing, etc. If you spend a little time getting the fit right, it will be the most efficient hydration system you could currently have.

Plenty of storage in all the right places. Gels, bars, etc within easy reach in the front pockets, and non-essentials in the back (plenty of room for cell phone, ipod, maps, etc. Also elastic draw cord will cinch down on any extra clothing you may need or want.

This has the easiest bladder to fill, and more importantly, to clean. I love how easy the hose detaches so you can rinse and hang to dry. No moisture = no mold!

Cons:

I know you'll be excited to fill 'er up and hit the road or trails, but take the time to get it fully adjusted and fitting perfectly before you head out on a long run. I recommend filling it up and running up and down the street to get it adjusted properly. This system doesn't adjust easily on the fly (except for the sternum strap) and I experienced some bunching of the shoulder straps because I didn't take the time to get it dialed in perfectly before heading out. Take the time to get a great fit, and you'll forget you're carrying anything at all!

In the past I've been very satisfied with other products from Nathan, and so far, this one doesn't disappoint either! I can see it coming into play for day hikes and bike rides as well as running.

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5.0 out of 5 stars.  Best running hydration pack, December 20, 2010
By bupper
This is the best hydration pack I have yet purchased. I bought a second one as a gift. It is very very comfortable and does not rub or put pressure on your back or shoulders. It doesn't bounce if you run smoothly (I am a barefoot runner), but you can hear the liquids squash around a bit. It doesn't bother me at all. In 100+ degree weather, your back will get wet, but it still doesn't feel hot (from the pack). On other packs I've used, my back has gotten extremely hot. I use it on ultramarathons and extreme mountain/desert running. I have not experienced the bladder leaking, and I've had it several months. I must say the bladder is difficult to handle (it doesn't have a screw-top); however, you can do more with it like this (fill at streams, etc).

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5.0 out of 5 stars.  Excellent for runners, October 14, 2010
By Jean L. Tejeda
I had been looking for a way to hydrate when I did my long runs and I had tried out a water belt but I could never get used to all the bouncing. A friend told me to try a hydration pack. After doing some research I decided on the Nathan. I've had it for about a month and I can definitely say that it's great. It doesn't bounce as run. It allows you to carry a good amount of water and even has pockets for gels, keys, cell phone among other things. As far as people complaining that the bladder breaks easily I haven't had any issues yet. My only complain is that on the bladder it tells you to turn it inside out to clean but the opening is a bit tight for my hand, other than that this is a great product.

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2.0 out of 5 stars.  Not for me. . ., August 21, 2011
By Dsheldo
Disclaimer - This is the first running specific hydrating device I have run with, so I don't have much to compare it to. I purchased for use in a trail marathon with limited aid stations.

Summary:

I found this to be overkill for my event (marathon). It weighed me down and wasn't that comfortable. Maybe more appropriate for an ultrarunner who needs to carry food, liquid, and various support gear or someone training where there is NO support. I ended up returning this item and went back to running with a handheld bottle.

The good:

- No leaking. I noticed that this was mentioned in several other reviews, but I had no problems. Of course, I ended up returning it after one training run.
- Bladder opening was unique and easy to operate.
- Seemed sturdy and well constructed.
- Lots of pockets for gear (unnecessary for me, but probably good for a lot of people).

The bad:

- First of all, I found the Nathan HPL (HPL) very difficult to fit to my body. There were no instructions on how it was supposed to feel or where it was supposed to fit. I did the best I could, but it was still very awkward on my first run (20 miles). In fact, I almost turned around after mile 2 to take this thing back to the car. However, after tightening the chest strap, it felt a little better. I still had the problem with my shirt riding up a bit in the back. I guess it's supposed to swing side to side but I found the motion very annoying.
- The bite valve was a bit odd and always seemed to want to swing in the wrong direction. Sometimes a bit difficult to get in my mouth on the move. I did like the clip that holds the drinking tube to your chest, though.
- The whole set up, when filled with water, felt very heavy. I know, water weighs what it weighs, so I don't really hold this against the HPL. But unless you really need to run with 2 additional liters of water I would recommend that you go with something much lighter. It will effect your training.

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3.0 out of 5 stars.  Almost great, August 1, 2011
By J. Hornick
Extremely comfortable - much better for running than camel back.

However, after 2nd use part of the shoulder strap came unstitched- not acceptable for this type of product. Also, mouth drinking piece is not great and leaks sometimes.

I like: ability to completely open the bladder for cleaning and comfort.

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5.0 out of 5 stars.  Super Lightweight and comfortable, June 30, 2011
By John Hastings West Jr. (Allison Park, PA)
I purchased this hydration vest for trail running based on scouring the internet for the best experiences. I agree with the opinions of others that this pack is excellent! One thing that surprised me is how comfortable it is. I really never have had any discomfort in any way from chaffing or otherwise. Very lightweight, but holds 2 quarts of fluid, + room for a cell phone, running gels or blocks, money, and a sandwich or two. Unfortunately mine was partially chewed on by the neighbor dog after delivery, so I had to replace the bladder with another. Of course it also has room for lashing clothing/hat/other gear on the back if it turns out you overdressed or may need additional weather protection during your run. I used it for my first Ultramarathon, a 50K. I highly recommend!

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3.0 out of 5 stars.  Great vest, bad water bladder, April 26, 2011
By pressm4n (colorado)
I have had this for about a year, I absolutely love the vest portion, the pockets come in really handy. I am able to put an additional water bottle in the back compartment and run with another hand held bottle. The vest is comfortable to trail or road run in even with the other bottle in the main compartment. I am able to keep all of my running gels, cell phone, ipod ect.

The water bladder in this was TERRIBLE. I only had the vest for about 3 weeks 4 or so runs and the rubber on the nozzle broke. I would have to buy a replacement for about 40 bucks, which I will not because Nathan brand water bladders are garbage. I have found higher quality brand vests for just a little more that. The higher quality brand would have a better quality bladder in it for very close price.

I would give this product a 5 Star review if that bladder were not junk. The vest is VERY well made and comfortable.

Hope this helps.

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5.0 out of 5 stars.  I like it, April 3, 2011
By Brad (USA)
I'm preparing for my first marathon. I usually carry a Nathan single bottle fanny pack, but when my runs get over two hours, a single bottle is not enough. I have used the Race Vest several times now. It is adjustable enough to fit my 6'3" frame. It is comfortable and I barely know I am wearing it. There is no noticeable shift side to side when adjusted properly. If you eliminate all the air in the bladder when filling, there is no sloshing noise. I carry my gels and cell phone in the many pockets, and the bungee cord on the back is effective for holding shed clothing. Others have noted that the bladder is deficient. I actually like the way it opens completely at the top compared to my camel back bladders with the round opening on the side. It makes it easier to clean and dry out. Only time will tell if lasts, but I have no issues with it now.

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5.0 out of 5 stars.  nathan hpl #020, March 23, 2011
By j
I'd read a couple of reviews that talked about the bag leaking but I haven't had any problems with that on the first couple of runs. The pack fits very well, little to no bouncing or chafing. I like the easy access pockets and extra storage in the pack for a phone/keys etc. Overall I'm very happy with the purchase and feel pretty confident the pack will serve me well for quite some time.

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5.0 out of 5 stars.  300 + miles, February 17, 2011
By dc (San Francisco, CA USA)
I love it. I take it on any run longer than 1 hour 20 minutes. I primarily use it for long efforts on trails. I was cautious when I hear that in some cases the bag burst. Mine has been problem free. I also love how easy it is to clean out. My tip is take your time when cleaning, don't be in a rush and nothing will happen to the bag.

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5.0 out of 5 stars.  Great product, October 6, 2010
By Multi-tasking
Rides nice. Good hydration system. Refilling the bag takes some practice, but easy to do when your delirious from either a long run or have cold fingers when compared to the twist top.

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5.0 out of 5 stars.  Works as advertised, October 3, 2010
By DJ
I bought this pack at the recomendation of a friend while we were preparing for a marathon. The pack is quite lite, and i really don't know it is there even when the badder is full.

The pouches in the front are quite handy for placing gel packs/chews/snacks for quick access and consumption during the workout, and the zipper pouch on the front and the back provide plenty of room for a cell phone/ipod/keys, etc.

Fortunately I have not had an issue w/ the bladder as other folks have, it has been pretty sturdy. However, I will keep an eye out for any seam breakdown during cleaning/inspections.

I love this pack and am quite pleased that I purchased it. Beats the heck out of carrying fluid in your hand or on a belt during those long workouts.

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4.0 out of 5 stars.  Great for the long haul, July 21, 2010
By steve calhoun (COLUMBUS, OHIO, US)
I wore this unit for the very first time on a 50 mile trail race in Ohio in June. It passed the test with flying colors. It is very easy to wear. My back does not get hot while wearing as the mesh is very open and well ventilated. The three pockets in the front are a HUGE selling point for me on this vest. It puts food, electrolyte tabs, gels, etc. very close at hand, which is right where you want them. I found the 2 Liter size to be perfect. Not too heavy but plenty of water for at least every 5 miles. In fact, I think I only refilled my reservoir 2 times during the 50 mile race. the only thing I would change would be for a way to adjust or tighten the straps while running without having to take off the pack. I thought I dialed it in fit wise prior to the race but during the race I found that as I sweat more and as the weight of the reservoir got lighter that I would have liked to tighten it up a bit. Not a big deal at all though and I got along just fine.
I LOVE the vest and I would highly recommend it to anyone looking to have plenty of cool, refreshing H2O at hand and also have goodies right up front so you don't have to fumble for them. I have had a certain belt model before and I have lost things out of the extra pockets that I bought for it. I would unzip a pocket and as I was running along something would just pop out. I lost 3 gels during a race with the belt model on. I will not go back to that brand and I am in LOVE with my Nathan. I think I will marry it. In fact, I am running the Burning River 100 mile trail race in Ohio in July and I expect it to perform jsut as well as it did on the 50.
Happy Running!

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4.0 out of 5 stars.  Nathan HPL 2.0 great, but distributor NOT so, June 30, 2010
By DH
I bought the Nathan HPL 2.0 and wanted a system that would be compatible with a filtration system I already have. The description said "2 liter hydration bladder with filter-compatible screw-top closure" Instead, I receive a bladder that requires you to fold and slide a piece of plastic along it to seal it. It is totally inadequate for use with filtration system!

The Nathan system is great and I know they have the bladder I was suppose to be getting! I feel cheated.

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5.0 out of 5 stars.  Love this hydration vest, much more comfortable than a backpack, March 6, 2010
By Jane's Husband (Albany, OR United States)
I have a large build (5'10" & weigh 190#) & take this on my weekend long runs (10-20m depending). After a little adjusting, it was immediately comfortable. I have had none of the problems others have mentioned. After you fill the bladder, you want to close it so you get out all the air you can out of the bladder to keep the liquid sloshing to a minimum. It is well ventilated and doesn't create hardly any heat on your back. If I want to use it to keep me a little cooler, I fill it with 1/2 ice and 1/2 water and can feel the coolness of the ice on my back and the water is cool to drink. It has a very good amount of storage space and easily accessible pockets in front for gels or bars. A short time into my run, I really don't think about it being on. I really like how securely the valve is fastened so that it takes some effort to open it. It does take a good pull to open it, but this ensures that it doesn't leak. The mouthpiece is easy to remove and clean. I love this vest and would absolutely recommend it.

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5.0 out of 5 stars.  Nathan Hydration Vest #020, October 7, 2009
By Margaret A. O'Donnell (Philadelphia PA)
We used the vest and found it to be comfortable. Rides high so it is not a drag on the back. There is a little strain on the shoulders that I need to get used to but I am not too concerned about that. Any hydration pac would do the same. The wide straps are nice, the pockets are adequate and it is light when empty.

Like others, I guess, the bladder and hose are very hard to clean and harder to dry. That may turn out to be a big problem. I had a Camelback before and the hose eventually got so cruddy that I had to dispose of it.

I would recommend this product to others.

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4.0 out of 5 stars.  Excellent design for runners, January 10, 2012
By Jobu
I've owned and used this hydration pack for about 10 months now and this is probably the most comfortable hydration pack I've tried yet! It fits very comfortably and high on your back. This is nice for when I go running because it doesn't bounce as much as other packs I've tried.

Also, the straps for your shoulders and chest is made of mesh, which is more comfortable against my skin (if I wear a tank top) and lets my body "breathe" more. The pockets are convenient and easy to access while running and the bladder can hold up to 70oz of fluid, which is quite a bit more than I usually need for my runs. (Even when I used it for my half marathon, I think I only used about 40 oz of it!)

You can tell that this pack was designed to be as comfortable as possible and has a sort of minimalist design. The vest pockets are only big enough to hold my iPhone on one side and a small snack pack on the other side. The small pocket on the back can hold my keys, wallet, and a couple of extra snack packs. The main back pocket holds the bladder, but even that gets snug and if it's half full, then I'll sometimes have trouble stuffing a long sleeve shirt in there. Sweaters are almost impossible. There are rubber straps on the outside that are supposed to hold your extra layers, but I don't fully trust them.

Now that I've sung this pack's praises, time for the critiques:

First thing I noticed is the tube connecting to the bladder is pretty thick and heavier than other packs I've used. It's also a lot less flexible which makes it less likely to kink, but can get unwieldy, when storing this away.

The mouthpiece is easy to bite to drink from, but you need to turn the piece from the on or off position to drink from it. I didn't mind this when I first began using this pack because it turned smoothly and firmly. Ten months of use, it appears has made this piece significantly firmer to turn and I have difficulty twisting the piece to close and open the valve. I usually just leave the valve turned to open, until I'm done with my run or hike. Unfortunately, I usually forget to close it again and this has resulted in a couple incidents where the mouthpiece was in contact with a sweater or carpet and leaked.

The final issue I'm currently dealing with is cleaning out the mouthpiece, tubing, and bladder. I've been flushing out the bladder and tubing about once a month, but a couple weeks ago, I left some mixed Cytomax in the bladder and forgot to flush it out. When I grabbed my pack for a hike, it reeked of something nasty and it turned out that the Cytomax got infected and was fermenting in the bladder. I'm flushing the whole thing out and giving it a thorough cleaning and mild bleach soak to make sure I get rid of as much of that infection as I can. The moral of that story is DON'T LEAVE MIXED SPORTS DRINKS IN YOUR PACK!

Overall, this product gets 4 stars from me. I think it's well made and its design was thought out well. The only thing that stopped me from giving it 5 stars was the increasing difficulty of twisting the mouthpiece to open and close the valve.

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4.0 out of 5 stars.  Comfortable, December 22, 2011
By E. Foster
The bag itself is great. It can be hard to adjust, which I would definitely say is one downfall, since quick adjustability is a necessity for long runs. The bladder is really nice, but the bite valve is hard to use. I felt like it was hard to open the valve to the extent that I thought I might chip my teeth. I took a camel bak bite valve and replaced the one that came with this bag. Overall, I really like the bag.

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4.0 out of 5 stars.  Perfect pack, September 21, 2011
By IM-mom
I chose this pack over the women's specific mostly because of price. I have a pretty small frame but the pack can be adjusted and fits great. I prefer it to all my other hydration packs including my camelpak. It does not bounce too much and has a lot of storage for such a light pack. Very happy.

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5.0 out of 5 stars.  not a bad ass runner but love this, September 1, 2011
By csclaura (LA PLATA, MD, United States)
I am a woman and run about 20 miles per week and race half marathons. I often train alone and it gets annoying to plan route around stores where I can get water, etc. I decided to try this pack because I am having trouble carrying enough water on long summer runs. Even with 2 handhelds and a planned stop, I was not staying hydrated. I just took this out for a little test run of about 3 miles. I have never been a big fan of backpacks and I worried that it would pull on my shoulders. I was described by another reviewer as more like a hug and i would agree. I didn't adjust the straps much at all and it was so comfortable.

I love it! You hardly notice it on and the front pockets are great for phone, ipod, and there is additional storage in the back for longer runs.

If you suck out the air from the bladder before you start, there is no annoying sloshing should (there are youtube ideas if that doesnt make sense)

I debate over the camelbaks because some are cheaper. This one was $57 when i bought it down from $89.

I decided to spend only a little more and go for this one because after reading many reviews, i saw that several athletes who put down some serious miles and run ultras had upgraded from a camelbak and were very pleased. I didn't see others leaving nathan for a camelbak.

I have 2 tiny little criticisms....one of the front pockets had a draw string and it doesn't close tight, I think things could fall out, though my ipod stayed in. The second is the way the tube attaches to the bladder, you have to really pull it apart for cleaning. i will probably get the plug-n-play adaptor that seems to make that part easier.

This is going to be great for my next long run. Worth every penny, wish I had gotten it before!

UPDATE-- I took this on a 14 mile, rainy, hilly run yesterday. It is great. No chafing, no bounce, no slosh(removed air from bladder). This is pack is far more comfortable than i would have expected. It was great to go for a long run without having to drop water along the route or plan to run into a 7-11. It is great to have my phone, id, money, clif shot blocks, ipod and PLENTY of room for other supplies. FABULOUS!!

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4.0 out of 5 stars.  Great pack for trail runners, August 30, 2011
By A. von Bormann
Was looking for a hydration system to extend my range on my 32km+ runs. The Nathan pack has an excellent fit. The suspension system ensure that the pack has essentially zero vertical or lateral movement on your back. Another great benefit is that the shoulder straps feel as if they are carrying no weight. A great hydration system for extra long runs (especially on the trails). It is also easy to clean which is an added bonus when compared to other hydration systems.

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5.0 out of 5 stars.  Just what I needed., August 3, 2011
By nockonwood
I only started running a few years ago in order to lose weight. I bought this because I wanted to go on longer runs in the summer months without getting dehydrated. This product is great. I don't even notice that I have the pack on. I stuff it full too. The only drawback that I even have is that when I am not listening to music I can hear the sloshing of the water even though I don't feel it. The water bladder hold plenty of water. Everything feels snug to my body so there is no bouncing around.

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5.0 out of 5 stars.  Fits well, works great, June 2, 2011
By Sickpup94
I bought this to run a 7.4 mile run in SF. It fits very snug when adjusted properly and doesn't bounce with each step while running. It's almost unnoticeable because it fits so well.

The pockets are perfect for a cell phone, wallet, camera, GU packs, etc.

I would recommend this for any run over 3 miles. It's awesome.

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4.0 out of 5 stars.  good for running, April 14, 2011
By t_bo
nice backpack for running, stays tight on your back. smaller in real life than it looks in the picture.

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4.0 out of 5 stars.  Love the vest, November 26, 2010
By Paul Egert (Eagle, ID United States)
Really love the vest, dosn't bounce around at all. Front pockets are great.
Only wish is that had a few more tie down cords in the back. Also, the hook to hold the hose isn't in th greatest place.

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4.0 out of 5 stars.  Great, September 17, 2010
By Linda
I have now used this pack twice. I really love it. One thing is my husband has the same pack but purchased about 3 yrs ago. It has a center pouch in the middled by the connection & mine doesn't. Plus it has a bigger storage area in the back for items. That is the only downside of the pack but it does the job for me.

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5.0 out of 5 stars.  awesome item, September 12, 2010
By ultrarunner128
This pack is totally amazing. It fits and rides incredibly well and is comfortable even after 50 miles of running. While a little confusing at first to figure out how to fill it, it has by far the best sealing method of any hydration pack I've ever used. I would definitely recommend this to anyone running long distances or who loves hiking.

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5.0 out of 5 stars.  Nathan HPL, July 15, 2010
By MR G (WILMETTE, IL, USA)
Great hydration vest. I have been running since a month and so far it is perfect. Looking forward to testing it during my next Ultra event. Very confortable and I am fine with the opening of the bladder.

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4.0 out of 5 stars.  Nathan running Vest, June 25, 2010
By Jennifer
The Nathan 2.0 liter running vest is great! The front closure is adjustable not only in tightness, but where the strap comes across your chest. I love the pockets in front and its got a ton of storage for nutrition. I wore this on my first 50 mile trail race and it was fantastic! I love the drinking hose too. The bite valve works very well, and it clips onto the chest strap so that it's not bouncing around. Even though this is a "men's" vest, it fits me very well and I'm only 5'2"! I love this vest and would recommend it to any ultra runner.

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5.0 out of 5 stars.  Awesome hydration pack, June 10, 2010
By Christopher A. Hays (LA)
This pack is awesome. I love the front pockets. You don't have to keep taking the whole thing off every time you need a gel or salt. It's also very comfortable.

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5.0 out of 5 stars.  Best hydration vest I ever owned!!, April 25, 2010
By Chrissy (Grosse Ile, Mi USA)
When I first saw the vest I thought it was for a child because it seemed so small. It adjusted to me perfectly and was so light I could hardly feel it as I ran.

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5.0 out of 5 stars.  Excellent to run with, March 15, 2010
By tico dan (San Jose, Costa Rica)
I use the Hydration pack both for hydration, and more often I take the bladder out and use the pack to carry things that will need during my trainings. It works very well, and is comfortable to run with it.

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5.0 out of 5 stars.  jogging, August 12, 2010
By Ashtin C. Hoffmann
I bought this so when i went for 2 hour jog i could have some water with me. It works perfectly. i bought it for $59 dollars. Tho if you are going to put stuff like gaterade in it be warry. your hands will get sticky. of course this will happen with every type of pack. since they usually have a way to shut the flow of water by pushing down on the mouth piece. which in turn will spray all the stuff still inside it on your hands. tho i just use water so its refreshing when i have drenched hands to run over my head to try to stay cool.

I would definitely recommend this for a friend or acquaintance

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5.0 out of 5 stars.  Would have "died" without it., May 20, 2012
By Regular Brian
The first time running with the pack hurt my back for a day or two (the muscles in the lumbar section) because I ran about 20 miles and was not used to wearing a pack. All runs after that caused no problems. I believe proper adjustment was the issue. When drinking the water, over time the pack will loosen, and need readjusted, which is very easy to do while running. On a 50k trail run (31.1 miles), I almost emptied the pack twice, and the aid stations were only about 10 miles from each other. (It was a hot and humid day.) A waist pack with 2 or 3 water bottles would not have worked well for me. The pack is super comfortable (with proper adjustment and a couple long runs after understanding how it feels running with a pack) and can carry a large assortment of items. 2L water, wipes, 1 pound of trail mix, 3 granola bars, whistle, pocket knife, car keys (keep to a minimum), and sunglasses in the elastic strap. The only thing I didn't know about when buying the pack is, "Do I need one?". Just because my running partner had one, I was reluctant to buy one for just that reason alone. I can run about 2 hours or about 12 miles without water. (I'm not saying this is smart or healthy, but it is my limit.) Knowing this, and knowing the type of races I wanted to do, is what made my decision much easier. Tip: get out as much to ALL air as possible. I've tried with and without air in the bladder, and with air becomes sloshy, is annoying to hear, and subconsciously throws off your stride just a little.

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3.0 out of 5 stars.  I have to dock some stars from a mostly-good product, May 2, 2012
By David R. Hicks (Arlington, Va.)
As others have said, the pack part of this is fantastic. It fits well, it rides well, the front pockets are useful. My only complaint is that the straps are hard to adjust. While you're wearing it, you can really only adjust the sternum strap. You don't often *need* to adjust the other straps, granted, but sometimes that would be useful -- such as when the water bladder empties out and you want to tighten the whole contraption down a bit.

The water bladder that came with mine leaked. It looked like it was nicked by a blade at some point. It was a very small leak; I didn't even notice until I got back from my first run and my back was soaked. I tried to contact Nathan for an exchange but never heard back. I didn't like the bladder assembly anyway, so I didn't pursue it. The drinking nozzle was too stiff and the hose inner diameter was too small, making it quite an effort to take a sip.

My recommendation is to buy this if you already have a camelbak or platypus bladder you like. If you don't, plan on spending the money to buy one. IMO, that takes this Nathan pack from "good deal" territory to "not so good".

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4.0 out of 5 stars.  works great, April 26, 2012
By C. Lambert (Va)
I tried to use the handheld water bottle and got tired of holding it in my hand. I have filled this thing up and it has not moved around.

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2.0 out of 5 stars.  Bad Luck?, April 14, 2012
By UberMoots
I have had the Nathan HPL 20 for about 2 months and over 400 miles now and after reading numerous rave reviews, I have to add mine. I love the design; I can fit my Droid, trail map, jacket and enough GU and water for 30 miles of trail running. The downsides are making me write this review... Frist is the mouth piece, mine leaks even when shut tight, and I have taken it apart a few times and attempted to correct the issue. Even worse is that the bladder leaks, a lot. So much so that put I the bladder in a large freezer bag to measure how much water it leaks on a given run and to attempt to salvage some of it. On the plus side I contacted Nathan customer service about the leaks and they were very prompt at shipping a full replacement bladder, hose and mouthpiece at no cost. The downside is that the replacement leaks worse than the original. It could be just my bad luck as I see numerous other reviews of no leaks, but I am moving back to my camelback as hydration is everything and I can't risk having it leak out.

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5.0 out of 5 stars.  Outstanding for long runs, March 27, 2012
By Zyme (California, USA)
This is my first hydration pack. I also have a diagonal Nathan 20 oz water bottle waist pack for shorter runs and cooler days.

I was careful to read about this because I specifically wanted something for long runs, not hiking or biking. The weight of the pack is supported by a soft plastic "T" that sits below and outside of the pouch with the water bag. This connects through two straps around to the bottom of the front shoulder harnesses. As a result, the weight is mostly supported by compression around your midsection. None of the weight is hanging on your shoulders. Also, this means the pack is snug around you without jostling or swaying. After 15 miles I have no discomfort at all.

By the way, it's highly adjustable but I'm 5'11" 160 lbs for reference. I find it to be very comfortable.

Some people have had problems with the mouthpiece. It has an end piece that twists to shut it off (biting the mouthpiece won't work). I have had no problems with this, but others have.

When I use it I have my (Droid X) phone, ID, 2 GU packs and all that fits just fine in the back and front pouches.

I didn't pay attention the first time I opened the water pouch. It has a foldable flap that a clamp slides over to seal. If you fold it the right way, the smooth hard plastic faces outward and the clamp slides on/off easily. If you fold it the other way the soft rubbery plastic faces outward and it's very hard to get the clamp over it. It's completely obvious if (you're not as clueless as me?) if you've done it once. It does not leak--nice system. By the way--very very easy to clean, don't buy a brush or any tablets. Just a teaspoon of bleach in 2 liters of water to soak, including the tube, then rinse thoroughly with lots of water.

On a hot day and a long run this was just perfect.

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5.0 out of 5 stars.  As it should be., February 15, 2012
By Jared
First, let me say something about the delivery process. I ordered this thing on February 10 (Friday) and it got to my door on February 13 (Monday). I really can't say anything bad about the shipping. I've always gotten great, on-time shipping from Amazon orders and I am consistently impressed by this. It deserves recognition.

Next, the pack. I love it. I have an oddly shaped back because of a surgery I had a decade ago. My back isn't flat, meaning most running hydration packs rub on me because they're designed for people with normal backs. I'm not saying the Nathan is built for people with messed up, weirdly shaped backs. However, the pack itself is so small and rides so high that there simply isn't enough surface area for it to rub my back oddly on longer 10+ mi. runs. The straps take a little work to move around, but I don't think that's an issue w/ Nathan so much as it is a reality of a pack like this. I've noticed with a lot of packs I've used through my life that the straps slip a lot while you're moving, ruining your settings. These straps aren't going anywhere, and I actually have to take the pack off to adjust them. The fact that there is an upper and lower strap is great, since you can do more custom adjustments to get a very personalized fit. It barely moves on me when I run.

Also, I love the reservoir. The slider-closure is way easier to use than those screw-top ones.

One thing I don't like pretty small, but I can see how it would annoy someone: the top of the harness. Unlike other packs that have separate shoulder straps, the Nathan uses this single piece that acts as a harness. If you don't adjust the pack in just the right way, I've noticed that the top of the harness can dig into the back of my neck since the pack rides so high.

I bought this pack because my wife got another Nathan pack (the Endurance??) and she loved hers. This pack looks very similar to hers and has the same suspension, pockets, and everything else that hers has so I tried it. I'm very happy with this product and the service I received from Amazon.

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5.0 out of 5 stars.  Well-designed product, January 29, 2012
By Trail man
I have taken the Nathan 020 on about a dozen runs and so far I am very pleased. I found that it fits snug to my body. When I fill the bladder to the 2 liter mark I do notice some sloching when I run, but there is very little bounce of the pack against my body. This is a very lightweight vest. The weight is noticable when filled all the way up, but when it is half full or less it almost felt like I had nothing on my back. I have not had any problems with the bladder leaking, as a few others have. The pouches in the front are an excellent feature: they allow for easy access to a snack, camera, small gloves, etc. The pouch on the top is big enough to hold some small items: cell phone, headlamp, extra socks. I have used the cinch cords on the back to hold a long underwear layer as I warmed up during my run, and this was yet another handy feature. I would recommend this vest for a trail runner or hiker who is looking to cover longer distances with minimal weight on the back.

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5.0 out of 5 stars.  fantastic!, January 22, 2012
By Donnie Marko
Its great for long runs, hikes, or general outdoor activities. When you need to bring extra little things like your wallet, headlamp, snack, camera this thing will hold it all. Comfortable and practical. Highly recommend!

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4.0 out of 5 stars.  Longer distance must have, November 20, 2011
By Will
I've owned one of these for 3 years. I bought it for longer runs (10km. + of trail). I was using a 30l Soloman day pack prior to this but wanted a smaller, better fitting system.

The Nathan fits me great (I'm 5'6" with a 40" chest), it holds 2l of water without much side-to-side sway and no discernible up and down motion.

The front pockets are big enough to hold some bars, a gel container and your keys. One pocket is zippered and the other uses a draw-cord. I'm not big on the draw cord as I find the release button much to small and hard to operate, especially with gloves on. The rear compartment has room for more than just a full 2l, I carry a small 1st aid kit (band-aids, tape and tylenol) extra bars (for long runs only) and a superlight shell jacket. There is also the bungee cord on the outside but I never use it.

I like the 2l reservoir. It's the best reservoir design I've used, ie. wide mouth for easy cleaning (and you can turn it inside out to dry) a fool-proof closure and an easily removable hose. I don't like the mouth-piece design though, I find it harder to draw from and not as easy to clean as the excellent Platypus mouth-piece. It's a tight fit but the Platypus one will slide over the Nathan's over-sized hose for the best of both worlds. That over-sized hose means that the Platypus hose cleaner is too narrow to scrub the inside of the Nathan's hose.

I've used the Nathan pack maybe 30 times and so far and it shows virtually no wear (why should it though?). The reservoir gets used for all my outdoor excursions (maybe 200 uses now) and has never let me down. The reservoir is slightly discolored and abraded (from being in a mutitude of dirty packs) but it hasn't affected the performance at all.

Except for the draw-cord and the mouth-piece I'd rate this product a 5.

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5.0 out of 5 stars.  Excellent running pack, October 31, 2011
By Tyrone Shews
I have logged hundreds of miles with this pack. Hands down the best designed running pack. No sloshing and no chafeing. Light weight is perfect for long runs. Pockets in front perfect for a cell phone, can of pepper spray and energy gels. Hydration bladder is holding up no problem.

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4.0 out of 5 stars.  This thing rocks, October 15, 2011
By R. Zier (Las Vegas, NV)
I bought this for running because I hate those waist things. It's a mens pack but I'm a small female and it works fine. There's quite a few straps to make it really adjustable. You can hear the wager sloshing bit can't feel it. I'm really glad I got it.

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5.0 out of 5 stars.  Nathan running pack, September 29, 2011
By Matt Lindemann (Brooklyn Park, MN, US)
I would highly recommend this running pack. In the past I have used camel and laken pacs and there is no comparison. The nathan pac uniquely forms to the contours of the back eliminating the erratic movements you feel with other pacs. I have used this pac for distances up to 26.2 miles on the trail and found that it had more than enough room for 2 liters of water as well as energy supplies. So far, the bladder has been great. I like that you are able to flip it inside out to clean. Lastly, the harness and chest strap are customizable for a variety of body sizes. I have given away the camel and laken pacs as I will never down-grade to those products again.

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5.0 out of 5 stars.  One of the best running packs out there, September 24, 2011
By drunkmonckey (ALLEN, TX, United States)
First of all, this is one of the highest reviewed running packs out there on ultrarunner blogs I follow. The soft mesh of the pack, adjustable fit, and weight are as good or better than any 70oz water pack out there. Additionally, amazon has it cheaper by about $20 than I've seen anywhere for any pack in this range.

The description is wrong as it does not contain the screw top bladder like camelbak. Some complaints on here about that, but this is the newer version w/ the bladder designed by hydrapak who, imo, make the best bladders out there. Easy to fill since the entire top opens, seals solid w/ the clip, and you can turn it inside out for easy drying so you don't have to be putting bleach or whatever people are doing to prevent mold. Camelbak made a good step forward w/ their quarter turn open and close bladders and you could easily switch out to one of those, but I really think the clip top is superior.
One tip, as others have mentioned, after you fill and clip it, just flip it over and suck out any air and you don't have to listen to sloshing.
Only negative for me is I wish they made this pack barebones w/ the mesh harness and bladder as I rarely carry gels or anything w/ me other than maybe some salt tabs and honey packets. Hydrapak e-lite Hydrapak E-Lite Vest Hydration Pack, 50 oz (1.5 Liter) fits that bill, but only holds 32oz (product title is wrong) and I'd rather just carry 1-2 handhelds (love the contoured 20oz amphipods - Hydraform Handheld Water Bottle - they also make a version w/ a neoprene sleeve that keeps the cold in.

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5.0 out of 5 stars.  Perfect, September 10, 2011
By R. Shuping (North Carolina)
I was worried about the seal based on some other reviews but it is without defect in my experience. I ran three 26+ mile runs and it has been great. Downsides have been the back of my shirt is pulled up when I'm running with the backpack and the bladder is full. I have to tuck it in to keep that from happening. Also, it does definitely slow your times. However, I love the freedom it has given me to not have a cooler that I have to keep returning to and therefore limited in where I can explore. if you are interested in backpacks this definitely has to be one to consider.

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5.0 out of 5 stars.  Exactly what you want for a hydropack, and at a great price, January 14, 2012
By My average review score is 3.74.. (San Francisco, CA)
I rate items based on three criteria - Does it work as advertised? Does the value justify the cost? Does it improve my life? I put my recommendation at the top, then answer those three questions below.

RECOMMENDATION

I definitely recommend this hydro pack to trail-runners and day-hikers. The snugness is perfect (not a lot of jostling), the bladder is relatively easy to deal with, and there are plenty of places to stick snacks and sunscreen and other essentials.

FUNCTIONALITY

The pack itself is very light, and even though the water adds a lot more weight, the distribution is quite adequate. The nozzle works well, and the whole system has proven to be pretty durable. I'm not particularly gentle with it - I tend to cram it in my suitcase without much regard for the hose or nozzle, but I haven't had any problems.

VALUE

In terms of value, this pack seems to offer much more than Camelbak's competing products. I love the basic Camelbak bladder, but their packs are really expensive, and I haven't been able to see any advantage they give over the Nathan.

DOES IT IMPROVE MY LIFE?

If you're a trail runner, or if you want to get into trail running, you need a hydration pack. I picked this thing up before my first trail run, and right away I saw a lot of other runners with the same pack. It made me feel like I looked more like I belonged out there.

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