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Custom-fit suspension systems are Osprey's bread and butter, so it makes sense that the Hydraulics Hydration Reservoir is shaped with a rigid backer plate to prevent any interference with how your pack fits and carries. The durable MPE reservoir material keeps water tasting exactly the way it should, and the magnetic bite valve keeps the hose secure when you're cruising up the trail.

  • Metallocene PE reservoir material is exceptionally strong, taste-free, and BPA- and PVC-free
  • Antimicrobial formula keeps mold and bacteria away
  • Wide-mouth cap is easy to fill and has a 3/4 turn for quick and secure closure
  • Front handle makes the reservoir easy to fill and insert into the pack
  • HydroStatic backer plate allows the reservoir to maintain a low-and-wide profile, preventing interference with your pack's suspension
  • Magnetic bite valve with included sternum strap magnet keeps the hose secure when hiking
  • Bite valve can be quickly closed with a 180-degree shut-off valve
  • Flexible 1/4 inch water hose increases flow for satisfying thirst quenching

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Osprey Packs Hydraulics Hydration Reservoir

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Here's what others have to say...

5 5

bought as a gift, works great

  • Familiarity: I gave it as a gift but have feedback to share

Bought for my gf, and she's happy. so i'm happy.

4 5

Again, the cap...

  • Familiarity: I've used it several times

Like others have commented, at least with mine, the cap has to be torqued about as tight as I can possibly make it. I learned this after packing my Osprey Aether 70 and noticing a puddle forming below it on my hardwood floor! Problem is, it's then extremely difficult to UNscrew the cap. I may try the olive oil tip and/or ask Osprey for a replacement cap.

5 5

Best Bladder on the Market

  • Familiarity: I've used it several times

I have used a number of bladders, including the classic Camelbak bladder, and after using this one I won't ever go back. I have been using Osprey Packs for years and love how they are pretty much all equipped to carry one of these bladders. The easy fill handle is great, it helps orient the bladder so that you can efficiently fill it, unlike the Camelbak, which flops all over the place. This bladder also has a built in plastic back panel which gives the bladder some structure and also serves as reinforcement for the back panel in your pack, together they form a seamless union, you wont feel a difference in how your pack fits regardless of if it has the bladder in it or not. The hose tube is a wider diameter than the Camelbak, so it lets you drink water faster if you so desire. The bite valve is great as well, and i love the locking mechanism, if you have the valve bent at an "L" it will let water flow out, but if you have it straitened out it will lock off the valve. One last thing that puts this system over the top is the magnetic attachment that holds the hose in place when you aren't using it. Just attach the magnet to your chest strap and the bite valve will automatically attract. Osprey thought of everything when they created this system and truly produced a superior product to all the other alternatives on the market.

Which water bladder fits i the med small osprey pack?

5 5


The 2 liter is ideal to put in seriously any pack. You can always put a bladder in the standard slot on an Osprey pack, or throw it in whatever pack you're using. I really like the mouth piece on Osprey verses Camelback. I like that, not only do you need to bite the mouthpiece, but also untwist the lock, so water doesn't leak. The overall bladder is higher quality by comparison as well. It just feels more sturdy. I don't ever stress about a possible puncture.

1 5

Is it raining again, because I'm soaked

  • Familiarity: I've put it through the wringer

Leaked a little the first time. Leaked a little more the second time. Completely emptied out on me the third time. I am in the military and used it on a frequent basis. The cap is a bitch-and-a-half to get on right. And even when you think you got it on, forget it you are gonna get wet. Along with everything you own in that pack. Look elsewhere for one that works well.. Unless of course you are looking to take a constant shower while packing around, and if you do decided to buy this make sure you bring soap. Might as well get clean while it empties out on you.

Is this compatible with the kestrel 48?

Responded on

Sure is! Either the 2L or 3L will work well for you in that pack!

5 5

An absolute beaut of a bladder

  • Familiarity: I've put it through the wringer

There are so many features on this bladder that make it darn near perfect. I have always had problems with bladders folding and the plastic plate on the back of the bladder makes it easier to put in and out of packs, easier to fill, and almost eliminates the struggle of getting water from the last third of your bladder. The over all design with the plate also keeps it very long and rectangular but super thin. Another great feature is the handle on the front. I cannot tell you how many times I dumped a full bladder of filtered water out onto the ground because it was hard to hold. The handle makes it easier to fill, easier to open and close, and guides the hose more efficiently. Probably the best part is the magnetic bite valve. Not only is it simple to use, but the magnet on the end makes it super convenient to drink from. All you have to do is hook the other included magnet to your sternum strap and feed the hose through the guides on your shoulder strap and bam. When you are done drinking the magnet holds it in a convenient place where it wont flop around. Also, none of that nasty plastic taste of regular bladders. You sip from this and what you taste is the water you pumped into it. Osprey did a great job with focusing on the little things when they made this bladder and it has made my life a ton better. I highly recommend picking this up and dropping any other bladder into the can.

4 5

no spineless guppy here

  • Familiarity: I've used it several times

Maybe my favorite hydration bladder that I have used personally. The drawbacks are far and few between, and in my mind are limited to the fact that off brand after market accessories are geared towards camelbak. Inline fill kits may not be compatible with the tubing right out of the box, and so on. However this bladders charms more than make up for this. First thing you'll notice is that this reservoir has structure. Which in my opinion makes it infinitely easier to fill and place in ones pack. This also keeps it relatively close to you back panel at all times. The lid closes easily with minimal likelihood of cross threading. Which I feel is an improvement on the short comings of competitors.

2 5

"I need a Urologist"

  • Familiarity: I've used it several times

" Bladder Rupture" "Kinked Hose" Seriously...its true!! I did get about a years use out of my reservoir. After my first month of use the tube kinked and would occlude flow about every other use... Very Annoying!!! After one year of use the outer portion of bladder had about 3 areas that had leaking cuts in the bladder from inserting it into a backpack. Didn't realize Osprey only had a 1 year limited warranty on hydration systems.. Oooops!! I should have returned it within the first year and bought something else.. I learned my lesson..

Hello Friends,
Will a 3 liter hydration reservoir (bladder) fit a Ospry Raptor Pack 10?

Best Answer Responded on

Hi bq of SoCal,

The specs on the Osprey Packs Raptor 10 Hydration Pack - 610cu in show a reservoir volume of 100oz so that will work perfectly with a 3L Osprey Packs Hydraulics Hydration Reservoir :) I just purchased the 3L and love it - let me know if you have any questions about it!



4 5

Happy Hydraulics

  • Familiarity: I've put it through the wringer

I’m pretty old fashioned when it comes to my water transport, but decided to give this water bag in a 3 L a try. I took this new fangled bladder out to Grand Staircase Escalante National Monument for a month of fieldwork and it actually did really well – no leaking issues from the body or the hose. It was really nice being able to drink water on a hike without having to stop to pull out a bottle every thirty minutes. The back of the pack is made of a harder plastic, making the overall structure pretty strong.

I made the mistake of leaving my pack and reservoir out of the tent and a small mammal chewed on the bite valve, but thankfully Backcountry sells a replacement ( for Osprey Packs Magnetic Bite Valve replacement).

To conclude: I ended up really liking this product, but I do have one piece of negative feedback. The lid looks like if should work just fine, but the plastic bit connecting the lid to the bladder causes drag, making lid closure much more of a two hand job, meaning that sometimes lid screwing was a two man job.

5 5

Not to big - not to small

  • Familiarity: I've used it several times

3 L reservoir is just the right size... Provided enough water for my long/hot hike and doesn't consume much space in my pack(s). I felt it was easy to clean, no icky plastic taste. The handle and hardback make it easy to fill and keep shape. Another great Osprey product!

5 5

Great hydration system

  • Familiarity: I've put it through the wringer

Its a hydration system, what all could be so special about it right? Well, not entirely.

There are a few standout features that really sell me on the Osprey series. It comes with a magnet system to put on your pack's chest strap which is super convenient and keeps it out of the way. The handle makes it so that the battle at the sink is no longer a horrible losing war ending in at least one part of your clothing doused in water. And the back side of the bladder haw some reinforcing to prevent bangs, bashes and tears that are too common in ending the life of other bladders.

If you have any questions, feel free to give me a ring:
1.800.550.2639 ext: 4686

5 5

Osprey > Camelback Reservoir

  • Familiarity: I've used it several times

Bill Porreca recommended this reservoir for my replacement of my camel back. I'd have to say, this bladder is amazing. The feature of the handle really makes it easy to get as much water into the reservoir at the level you desire. The larger openings helps as well. Although, I'm not sure if this is available or not, but would like a sleeve for it in case my Osprey pack doesn't have one built in that I can attach to it.

5 5

Great little feature

  • Familiarity: I've used it once or twice and have initial impressions

This bladder was recommended by my gear head for an upcoming week in Glacier National. I picked up two new packs and a bladder for each. There a couple of nice features. 1st the handle supports the bladder nicely in a horizontal position for easy refills. You can actually do it one handed. The other feature I really enjoyed was the magnet clip on the mouthpiece. You can attach the corresponding clip on your pack and the mouthpiece will stay locked in. No reaching around to find the tube. It was right there in front of me all day. It was the envy of everyone on the hike.

Responded on

I'm stoked this bladder worked out for you! For anyone interested in setting up an order and wanting to find out the perks of ordering through me, shoot me an email at

3 5

One Flaw

  • Familiarity: I've used it several times

The one major design flaw in this system is the connection point between the hose and the bladder. Halfway through my second time having this out, the hose unattached and I lost most of my water and soaked my pack. I do however love the handle and ease of filling. The screw cap doesn't work as easily as camelbak's antidote reservoirs, but I do appreciate the way this bladder integrates with my Osprey pack.

5 5

Works like it should

  • Familiarity: I've put it through the wringer

This is solid bladder. I have been using this for years, not too much to say. It provides a good flow of water, the design is well thought out, I like the magnetic clip, it is easy to clean and dry, and the water never tastes funny. There you have it, this is a good bladder, I honestly dont know how they could have made it better, except for maybe maybe making it lighter, but that would sacrifice its durability, and maybe make the hose detachable.

4 5

Simple, reliable

  • Familiarity: I've put it through the wringer

I prefer this to the traditional CamelBak reservoir because it has a plastic frame that keeps its shape regardless of how full it is. The hose is nice (although not detachable, which is a little annoying). I'm on my 2nd one of these, it comes on every hiking/biking/camping/etc trip I do.