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Osprey’s Hydraulics® 2L Reservoir by Hydrapak is ideal for large volume packs and long duration activities. The HydroStatic backerplate provides structure for easy loading into a full pack and maintains a flat profile. Thoughtful design makes filling, cleaning and most importantly staying hydrated on the trail easier than ever. All parts are BPA-free, phthalate-free, lead-free, guaranteed. All materials are certified food safe according to FDA and EU regulations.


  • Hydrostatic Backerplate - Hydrostatic backerplate provides structure to shove a full reservoir into a fully loaded pack and maintains a flat profile.
  • Slide-Seal - Easy Slide-Seal top opening, seals watertight and provides wide access for easy filling and cleaning
  • Pour Shield - Pour shield extends the collar to ease filling in shallower sinks and control pouring into pots or bottles
  • Carry Handle - Carry handle allows easy reservoir management and filling
  • Magnetic Bite Valve - Magnet clip attaches to the reservoir hose and pairs with the included sternum strap magnet for easy water access and hose management
  • Hydrapak Blaster - Hydrapak Blaster bite valve offers fast, smooth water flow with a ¼ twist on/off switch
  • QuickConnect System - The QuickConnect system allows easy removal/filling of the reservoir and filtering in the backcountry


  Volume Dimensions Weight
O/S 70 in3 / 2 l 14h x 6w x 3d in. 0.66 lbs.
O/S 70 in3 / 2 l 35h x 15w x 6.5d cm 0.3 kg
TPU film
TPU film
TPU film
Product Manual Additional languages available here »

Hydraulics™ Reservoir Product Tour


DO NOT buy


Bought this product specifically for a 40 day backpacking trip. It broke on day 7. In 2 places. Bladder easily punctured (3 times to be exact), weak mouthpiece. Attempted to get replacement parts TWICE from company, failed miserably both times.

Boulder, Colorado


Good Product and Even Better Customer Service/Warranty


I have had my 3L reservoir for over a year and have used it for my daily commute via bike and backpacking trips. It is a stable pack and has a easy to use hose and mouth piece. It functions well and gets the job done. I will say however, that when you are filling the pack with all 3 liters, it can get cumbersome to hold weight wise as well as hard to keep the mouth open to allow water in (it's almost like you need 3 hands to fill it. One to hold it up, one to hold it open, and one to turn on/off the water). Additionally, my pack was damaged when I was packing my backpacking bag and I needed to replace it. Luckily, the Osprey ALL MIGHTY GUARANTEE cover the damage and I was easily able to report the defect (via computer with pictures) and received a new pack (minus the hose and mouthpiece) within 2 days. The customer service was very fast to respond and even gave me a tracking number to track my new pack.

Boise, Idaho


Tastes terrible


The horrendous plastic taste did subside after a year and a half, but at this point the port where the hose connects to the bladder leaks from a dozen or so cracks and the hook on the zip lock clip has broken off. The plastic also discolored very quickly. I did enjoy some of the more refined features, but I have used camelback bladders for four times this long with no worse issues than a few leaky bite valves. This bladder has really spoiled my Osprey Zealot bike pack for me.

Erie, PA


Not good


A poor design. The fancy hose holder attached to the top of the bladder pulls away from the bladder creating a hole. First use.

Newcastle AUS


Tastes like weed killer smells


I find it a good product except for the taste. I have rinsed it over and over and the taste does not go away. The reservoir has developed a yellow coloured band inside which makes me wonder if there is not a reaction between the plastic and the chlorine in my town supplied potable water.

Houston, BC


Great design. Easy to use.


I filled this up with ice cubes, cool water and a dash of lemon juice. It works great! I'm surprised at some of the negative reviews. If you compress the bladder hard it's going to give; just like your own bladder 😉. New plastic off gasses; maybe we shouldn't be using platics at all - but thats another debate.

Vancouver Island




Osprey is typically known for thoughtful design, quality materials and construction, and intuitive and utilitarian features for their products - the Hydraulics Reservoir is the exception. The previous Reservoir was much better (albeit with its own design flaws); it did the job. This new/current hydraulics reservoir is poorly designed with low quality materials: - The plastic is too thin and punctures easily where the handle meets the plastic. - The plastic itself smells horrible, cheap like chemicals AND it certainly makes every drop you drink from it smell/taste so strongly of plastic it is hardly drinkable, especially during a strenuous hike. If you're thinking the smell/taste will subside over time, you'd be wrong. - While the carry handle feels better to hold than the spine handle on the old design, the "Slide Seal" top opening to fill your water needs to be held open with two hands (like a coin purse), so it's a little nonsensical when one hand is already holding the handle. - The detachable tube is a nice touch, but the portion that is affixed to the sleeve itself can NOT be removed (like the old design could)...this makes cleaning it impossible. - The magnet clip that attaches to the bite valve does NOT stay stationary, so the clip constantly slides down or off, making it a nuisance. - The old design had a long handle like a spine, which made the sleeve rigid for easier loading into a tight pack. This design and the extra thin sleeve plastic makes it very difficult to load into a pack, so you feel like you're pushing against a water balloon, risking puncture or tearing it away from the seams where the sleeve is attached to the hard plastic carry handle. Truly, this is the worst design water sleeve ever...very surprising coming from Osprey - and a MAJOR disappointment. Do not buy it, you're wasting your money...try another brand for a water sleeve.

Honolulu, HI


My favorite reservoir by far


I 'm surprised by the number of negative reviews this thing has. It's by far my favorite hydration reservoir I've ever owned and I've owned a ton of them. The new closure is so much better than the large twist shut mechanism on the older osprey & camelback reservoirs. It's so much easier to make sure it's closed properly and won't leak, but the opening is still nice and big for easy filling and adding ice. At first I was a little annoyed that the top doesn't have a hanging hook, only a loop, but it was pretty easy to modify my hiking backpack to hold it. The loop is probably way less prone to breaking than the hook. I love how easy it is to clean, and I've been using it heavily for several months now and there have been no issues with build quality or durability. All the hose connections remain tight for me, even though I take it apart fairly often to clean and move between cycling and hiking packs. I love the feel of the bite valve compared to a lot of the competition out there, and the water flow rate I think is absolutely perfect. It did have a plastic-y taste when it was brand new, which isn't unique to this bladder. I put about a 1/4 of white vinegar in it, filled it up with water, sucked it into the tube, and then let it sit for about 30 minutes before emptying. Took care of it. My only gripe at all, is the one that came included with my Raptor 14 didn't include the quick connect so I had to buy that separately. Boo. That felt a little like a bait & switch, but maybe the raptor i bought was old stock.

Austin, TX


Cannot compress!!!


I purchased this bladder for a 3-day hike of Mt. Whitney. Little did I know, the bladder cannot be compressed while in your pack without leaking over the top. On first use, I filled it up to max capacity, inserted it into my 65L Osprey pack, proceeded to secure my pack my cinching down all straps and, the bladder started leaking immediately. What is the point of a bladder if it cannot be squeezed without leaking? I was reduced to filling it up only half the rest of my hike. Do not use this product if you will be packing a lot of gear along with it, if so fill it only halfway.

Cincinnati, OH


Not for mountain biking


Terrible: 1) Water tastes like chemicals/plastic. 2) Out of the box, the valve leaked on my lap, and I could only suck in air bubbles, so I had to buy a new valve for $6. 3) The non-adjustable 45 degree bite valve makes it very difficult to get the valve in my mouth in a position so that I can suck water from it. Whose stupid idea was that? All bladders require an adjustable bite valve that can be set at 90 degrees--or more! 4) It takes one hand to hold the bladder, and it takes my other hand to squeeze the top to create an opening in which to pour water. Now, which other body part am I supposed to use to pour water into the bladder? 5) I'm tall, so for me the hose is about 2" too short.

Sedona, AZ



2.6 37


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