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Platypus Hoser Hydration Bladder
$23.95 - $26.95

Item # CAS0446

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  • One Color, 1L ($23.95)
  • One Color, 1.8L ($24.95)
  • One Color, 2L ($25.95)
  • One Color, 3L ($26.95)
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Item # CAS0446


A BPA-free hydration bladder for your hiking backpack.

You have a backpack and you'd love to stash a water reservoir with a drinking tube in it for quick, hands-free hydration on the trail. Grab the Platypus Hoser Hydration Bladder. Platypus made this reservoir with 100% BPA-free material, and added a SlimeGuard antimicrobial treatment to the inside so you won't end up with unidentified black bacteria camping out in your water bladder. The HyperFlow bite valve hooks you up to fast-flowing water, while the modular design fits into most backpack hydration sleeves.

Tech Specs

BPA-feee plastic, SlimeGuard treatment
[1L] 34 oz, [1.8L] 60 oz, [2L] 70 oz, [3L] 100 oz
Recommended Use:
hiking & camping
Manufacturer Warranty:

Reviews & Community


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Big fan

    I’m a big fan of the platypus bottles. They’re lightweight, pack small, and I’ve had great luck with mine being very durable. I just recently picked up the 2L to stick in my bike frame back for bikepacking trips. It works great! All my others are going on several years of use, from the office to the Wind Rivers.

    What's up with this thing?

    • Familiarity: I've used it several times

    Not sure if it's hit or miss whether you get a leaky one or not but mine leaks every time. I was excited about this because it is larger than my other bladders, and I keep trying it over and over, but it always leaks. Not a fan of a non-locking bite valve either. Always get water everywhere while trying to feed it out of backpacks.

    great bladder

    • Familiarity: I've used it several times

    I bought the 3 Liter bladder for my pack and its been a go to on any trip. It has an easy squeeze mouth piece and has a nice clip feature that easily clips to my pack straps so I don't have to go searching for the hose.

    Super thin

    • Familiarity: I returned this product before using it

    Returned this before using it, because the material was so thin. I've had hydration bladders leak before, and I didn't want to take the risk with something that felt like glorified plastic wrap.

    Great for water filter use

      this thing works perfect for filling from a water filter. Just attach a quck disconnect or take off the mouth piece and attach filter, pump, drain, or squeeze (depending on filter) the water in until full. I chose a setup that saved me both weight and money, here it is.

      Platypus Big lip 2L (filter bag/dirty water)
      Sawyer mini water filter
      Platypus Hoser 2L (clean water)

      Total cost $80
      Total weight 11.1oz less if you take out the extras for filter

      I fully trust in platypus's systems and warranty, as well as these reviews which seem accurate. All great reviews besides a couple people that got a defect and can easily swap out for a working one, or exchange it right here on backcountry because there awesome too!!

      Light and durable

        I was initially hesitant about this, but it has proven the test of time. I use it on bike rides and short hikes

        My Go To bladder

        • Familiarity: I've put it through the wringer

        I have this in the 2L for my trail run pack and a 3L for my hiking daypack and it has never let me down. Easy to use, light, easy to clean, and the hose works well. Have never had any leaks and fits in all packs I have put it in.

        Hasn't let me down

          I've taken this out on several trips, stored in my osprey pack. So far, it's done the trick!

          Faulty when delivered

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

          This bag split open along the side the first time I attempted to fill it. It appears that the seam wasn't properly bonded when manufactured.

          I like it.

            I bought 2 of theses for a 2 day hike. Both worked well. no leaks, no problems. hose is a nice length, not too short not too long. No frills here, just a basic water sack, which is really all you need.


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

            This bag leaks at the cap. Had a whole bag leak in my trunk getting all my gear wet. Pass on this one folks.

            Unanswered Question

            Can anyone tell me which is the best way to clean one of these, please.


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

            Connections are tight and there haven't been any leaks or annoyances. Seems very well-built.

            Platypus Cust. Service is Awesome

            • Familiarity: I've put it through the wringer

            The bladder is very durable. I stepped on my connector cap and broke it, but Platypus was very nice and sent me a new one.

            Hydration is a Full Time Job

            • Familiarity: I've put it through the wringer

            I live in the desert and I'm super active. Not easy to keep up with hydration. I fill this every night and keep it by my head, because if I don't even have to sit up I will actually drink when I wake up thirsty. I also carry it every time I hike somewhere short just to catch up with hydration. Great when driving long bumpy dirt roads too....

            No leaky

              Platypus makes great durable products and this is definitely one of them. I have been using mine for about 2 years now and have never had any issues with it.

              Avg. ride time: 0m per week
              • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

              Prepping for Torres Del Paine

              Prepping for Torres Del Paine

              good bladder

              • Familiarity: I've used it several times

              I like it so far. Some times you feel like your sucking a tad too much air. But i have never owned another bladder so... Water tight seal so far, and I like it.

              you may be using it with the hose connection at the top? If so, you want it at the bottom for water only or squeeze the air out prior use (recommended). Then you can drink from it with the bag oriented any which way.

              Pro Tip: add in a quick disconnect and fill from a sawyer water filter for hiking. then you never have to use the small opening to fill with.

              Hoser Design Flaw

              • Familiarity: I've put it through the wringer

              In the early days, the 2 liter Hoser had a flat bottom so you could conveniently set it on its base for filling (like the platy bottles have). This was a positive feature which reviewers liked. The newer version of the Hoser has the ridiculous new "floppy tab" bottom (I am guessing it is cheaper to make) and now they will not sit stably on the ground for filling. This is a massive design flaw, which I have brought to CD's attention in the past, but it's being ignored. They need to bring back a Hoser with a flat base (like the bottles), or I will have to switch brands. Too bad, because everything else on this product is good.

              I've used my 3L Hoser for almost 5 years and have never noticed any problems due to lack of "standable" design.