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Osprey All Mighty Guarantee


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


Team Water Reservoir All The Way


Team Water Reservoir all the way! I will never understand why people choose bottles over bladders...and this new design has some awesome features. The back panel does help it slide in easily. It's faster and easier to fill than the older round opening. I've never had problems with leaking at the opening or quick release. I have a feeling that anyone reporting that is having leakage due to user error. Drinking from it is convenient- never have to stop to take a sip of water. I do slightly worry about the quick release breaking if it was to be stepped on or severely crushed and hit at the wrong angle, but I take care of my bags, so that concern is more so a pondering of how much force it would take to break it. The quick release feature is SUPER convenient. I don't have to struggle with the tube getting it in and out of the strap when I need to refill it. It definitely serves its purpose. Taste has never been an issue. Wash out the bag and tube and you'll be fine. My one frustration is the valve and on/off mechanism. I can not figure it out. I fight with it all the time. I have even broken one. I miss the old design. The old design had a more user friendly on/off mechanism and angle. It also had a fixed magnet that I like more than the new magnet that moves up and down and all around. The 3L has served me extremely well several times in the desert in August up to 14 miles (with play time). If I go anything more than that then I take an extra container. Backpacking in wooded areas I can go a full 24+hrs without needing to refill it. I have switched out all the 2.5L reservoirs that came with my bags for the 3L and it fits in those compartments just fine. Clean up is easy, especially if you get the brushes. This reservoir is one of the most important parts of my set up. Of course I recommend it.

New York


Used for 2 years, only very minor issues.


I'm honestly not sure why this product is catching as much guff as it is. I've noticed a lot of complaints stating that the bag punctured easily, burst under pressure, or it had a strong plastic taste. My personal experience with this bladder overall has been excellent. I've used it several times for multi-day/night backpacking trips and the only issue I've had with it is the plastic clip at the top that is used to suspend the bladder in your pack broke off about 18 months in of use. And I plan to submit a claim on their guarantee to get a replacement part so honestly not a huge deal for me. I do recall a slight plastic taste when i first used the pouch, but it didn't last very long at all. Also to address the complaints about durability I will note that I've been paranoid about punctures or overloading my pack and having to squeeze the bladder too much from the beginning of use and in turn I've been careful with the item. I mainly have been doing this because, you know, it's a bag of water and not a rigid plastic bottle/canteen. Seems like common sense to me that you would need to be more careful with any bladder you use? Lastly a note on the ability to dismantle the pouch. I found this VERY handy as i used the bag on a longer timeline and needed to start cleaning it regularly. It was very easy to pull all the different bits apart and scrub them with a pipe cleaner, etc.

Cleveland, OH


A lot of negative reviews about Plastic Taste....BUT...


A lot of negative reviews here about a Plastic Taste however did any of you read the Owner's Manual....didn't think so.....it says in there and I quote, "Some users may initially notice a plastic-like taste when using any of our products made with TPU. This taste typically subsides over time and can be eliminated bysimply squeezing juice from a lemon into the product, filling it with water, then freezing it. After frozen, remove, thaw and rinse." You're doing a disservice to people thinking of purchasing this reservoir! FYI



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



2.8 40


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