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  • Shape-Shift™ technology features a versatile baffle that can be zipped to slim the reservoir profile and unzipped to increase fluid volume or reverse to clean and dry
  • To clean, simply slide open, reach in, reverse, and rinse
  • High-flow bite valve with twist shutoff; Straight Shot Plug-N-Play connector allows easy tube removal while keeping the reservoir securely sealed
  • Durable, flexible thermoplastic polyurethane materials are BPA- and PVC-free, dishwasher-safe and naturally anti-fungal
  • All seams on the Hydrapak 2L Reversible Reservoir are welded to eliminate leaking


View all Hydrapak Reservoirs

REI membership


Best Use Hiking
Bite Valve Shut-Off Switch Yes
Wide-Mouth Opening Yes
Quick Disconnect Tubing Yes
Material(s) Thermoplastic urethane
Dimensions 12.25 x 6.75 inches
BPA Free Yes
Weight 4.5 ounces
Liquid Capacity (fl. oz.) 70 fluid ounces
Liquid Capacity (L) 2 liters
Rated 4 out of 5 by from Great reservoir Great reservoir, very easy to clean and get completely dry. This is probably the best feature over other reservoirs I've owned. One thing worth noting that I didn't see come up is that the bladder only holds 1.5L when the baffle is zipped. When it is unzipped it holds 2L but the shape is much less convenient, it gets very wide and doesn't pack well in a sleeve in a backpack. It's not a big issue, but if I knew how much smaller it would be with the baffle zipped I may have opted for the 3L version.
Date published: 2016-03-19
Rated 3 out of 5 by from Nice reservoir but NOT 2 liters I love the design of this reservoir, but was skeptical about it holding 2 liters when I took it out of the box because it's tiny! So, I decided to try filling it up with a measuring cup. Turns out it only holds about 1.5 liters. I could understand if it was a little off, but this is a huge difference from what is advertised. Otherwise it seems like a great reservoir, so I think I'll see if the 3 liter one fits in my pack.
Date published: 2015-07-09
Rated 5 out of 5 by from Great 2L Reservoir Easy to clean. And it does hold 2 liters, but you have to unzip the internal baffle to get the full 2 liters - see the Hydrapak web page for how to do this. I usually keep the baffle zipped to minimize sloshing.
Date published: 2016-05-12
Rated 5 out of 5 by from High quality, great features This reservoir fits perfectly in my Ultimate Direction SJ 2.0 hydration pack. The bite valve flows nicely and I absolutely love the magnetic clip. Quality seems to be high and cleaning is easy. Great product!
Date published: 2014-08-06
Rated 5 out of 5 by from ken on the road Came with my VAUDE 8+3 Pack. Easy to clean, and rugged, turn inside out wash and dry. Open top fill with water and ice
Date published: 2015-06-24
Rated 4 out of 5 by from What did I ever do without this. I always relied on bottled water and a fannie pack when I went hiking. When I bought my Trail 40 backpack the sales person pointed out the reservoir compartment for hydration. Intrigued by this option I bought the Hydrapak 2L Reversible reservoir. Here is my review as a first-time user. I too thought the capacity was low but then found the baffle was releasable and this increased the capacity to the full rated volume. I'm quite happy leaving the baffle in place and the 1.6L capacity ample for my needs. I do like knowing that more capacity is available though. This was also my first exposure to a bite valve. I was skeptical at first but came to like it very much. Instead of stopping to grab my canteen or drink bottle and trying to drink on the go, I just pick up the tube and take a sip. I found that by the end of the day I felt much better. I attribute this to having sipped water all day instead of gulping water at rest stops. I was also very pleased/surprised with the flow rate through the bite-valve. The shut off on the bite valve is great. Especially after I placed my pack on a chair and it proceeded to leak onyo the floor. Now I turn it off when storing. The fold-over clamp opening was another feature that I liked since it allowed me to add a little ice to my pack so I could drink cool water. Those were the pros, now for the coins. I did notice a slight funk in the taste of the water when the water started getting warm but there was no sickening plastic taste like I've read about some other bladders. Their website has tips for getting rid of the taste but I haven't tried them yet. I picked this one for its being BPA free but also PVC free. Reversing the bladder for cleaning is a great idea but you have to wrestle with the bladder baffle attachment a little too hard for my liking. I hope it loosens up some with use. Their website shows how to open and close the baffle but I have not had any luck with their method. I am a new convert, and staunch supporter of hydration bladders. So much so that I just bought my wife a hydration fannie pack. All in all I am very happy with this purchase and would recommend this to anyone interested in exploring hydration packs.
Date published: 2015-10-04
Rated 5 out of 5 by from Long lasting, comfortable, worth every penny. I use the pack that this bladder is for every time I go running, cross country skiing, and biking. I have even used it on long motorcycle trips. The pack is comfortable and easy to use.
Date published: 2014-07-05
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Will this fit in the Salomon Skin Pro 10+3 running backpack? It came with a 1.5L version and I want a bit more water....

Asked by: GoCoDad
The 2 liter Reversible Reservoir will be too big for the SKIN PRO 10+3 SET. Salomon only recommends a 1.5 liter reservoir.
Answered by: REIservice
Date published: 2015-09-23

How long is the hose?  I don't see the hose length listed in the specs. 

Asked by: hiker4
The length of the hose is 36 inches.
Answered by: REIservice
Date published: 2016-05-12

Is the hose long enough for Osprey 65?

Asked by: stacielouwho
​The hose is long enough for your pack.
Answered by: REIservice
Date published: 2017-03-08

I have a Osprey Sirrus 24, would this fit that backpack? If not, what would you recommend?

Asked by: Klwright10
​This 2 liter reservoir is a great choice for the Osprey Sirrus 24 pack.
Answered by: REIservice
Date published: 2017-01-14

The black sliding top seems to slide too easily and doesn't "lock" in place like my Platypus Big Zip. Is this normal for this product?

Asked by: Pay Day
Because the reservoir should sit upright and still in the pack's reservoir sleeve, we don't believe there's a real concern that the slider will slide off the bladder when packed correctly.
Answered by: REIservice
Date published: 2016-06-29

I bought the Nathan Fireball Hydration pack, and am looking for a 1.5L bladder to use with it. Apparently Nathan no longer makes the bladder, or at least REI doesn't carry it. Will this bladder work?

Asked by: LunchSpecial
​This reservoir works as a 2 liter hydration reservoir for the Nathan Fireball Hydration Vest.
Answered by: REIservice
Date published: 2017-05-02

There is no compatibility statements for this product. I have an Aether 70 Backpack which I bought at REI. Will this 2.0 liter Hydrapak Reversible Reservoir fit this backpack? How about the 3.0 liter version?

Asked by: Goodguy the Hiker
The Osprey Aether 70 is large enough for either the 2 or 3 liter reservoirs.
Answered by: REIservice
Date published: 2015-09-20

I bought the Patagonia Petrolia Pack.  Do both the 2L and 3L bladders fit in my pack?

Asked by: JJpack
Yes, both reservoir sizes will fit in this Patagonia pack.
Answered by: REIservice
Date published: 2017-05-24
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