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Platypus Big Zip LP Hydration Bladder

Platypus Big Zip LP Hydration Bladder
$34.95 - $36.95

Item # CAS0447

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  • One Color, 2L ($34.95)
  • One Color, 1.5L ($34.95)
  • One Color, 3L ($36.95)
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  • Free 2-Day Shipping
    on orders over $50

Item # CAS0447


Easy to remove, clean, and use.

The Platypus Big Zip LP Hydration Bladder slides into hydration-compatible backpacks and maintains a low-profile when you're hiking, biking, or ski touring. Whether you refill the reservoir from a tap or water filter, the wide-mouth opening with Slidelock closure makes refilling the bag as painless as possible, while the treated lining prevents mold and bacteria from making your water taste like it just came from a swamp.

  • Stay hydrated on the trail with this reservoir
  • Wide-mouth opening makes cleaning and filling easy
  • Low-profile design sits comfortably in backpacks
  • Treatment prevents mold and bacteria from growing in bag
  • Angled shut-off valve prevents water from leaking
  • Made in USA with imported materials

Tech Specs

1.5L, 2L, 3L
quick release
shut-off valve
[1.5L] 13.4 x 7.9in, [2L] 15.6 x 7.9in, [3L] 17.2 x 8.8in
Claimed Weight:
[1.5L] 5.4oz, [2L] 5.6oz, [3L] 6oz
Recommended Use:
hiking, running
Manufacturer Warranty:

Reviews & Community


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Easy to drink from, refill, and clean

  • Familiarity: I've put it through the wringer

Fantastic product. Accompanies me on most outdoor adventures, unless the temp is well below freezing and I know the hose will freeze. Works well for day hikes, and longer adventures. It is easy to fill from a sink or backpacking filter, and can be hung up to make a great option for communal use in camp. It fits great in most bladder sleeves in most packs, and is a breeze to dry out and clean.
Get the 3L- you can always fill it less or roll it up if you don't need that much fluid that day.
I have found it useful to use a coat hanger to prop the bag open to help it dry out- just make sure to watch the sharp ends.

Great bladder!

  • Familiarity: I've put it through the wringer

Much easier to clean than the camelback bladders, and very durable!

Easy to Seal

  • Familiarity: I've put it through the wringer

The seal on this hydration bladder is great. It's easy to fill, slips into my pack nicely, and doesn't leak because of the shut-off valve.

CamelBak to Platypus, good decision

  • Familiarity: I've used it several times

Finally made the choice to switch to Platypus, definitely a good decision. The CamelBak I've had for a long time got a hole in it and it seems a lot less sturdy than the Platypus. The new one I just got feels sturdy and awesome. Used it a few times MTB and hiking. The mouth piece is a little harder to get water out of than the CamelBak however it doesn't leak like the CamelBak that I had.

Avg. ride time: 1h 48m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Easy to refill to keep hydrated

  • Familiarity: I've put it through the wringer

I reckon we all drink more water with a bladder than a water bottle--the straw is right there when you have a spare moment while hiking or riding. I am a HUGE fan of the Platypus Big Zip! The over-sized zipper closure makes it super easy to refill as you go, so you can stay hydrated while on the trail. The straw is easy to pop on and off, so you can keep the hose in place when you refill the bladder. Overall, this is an awesome and durable bladder I'd recommend to anyone!

Awesome Bladder

  • Familiarity: I've put it through the wringer

Durable and convenient, water bladders are the best way to stay hydrated on the trail. This one is very simple to use, has never leaked on my gear, and is still holding strong after a long spring and summer of putting it to the test here in the deserts and mountains of UT.

hands free hydration

  • Familiarity: I've used it several times

Great bladder, no hassle to fill or use. So much easier than having to take your pack off to find your water bottle to get a drink.

Great bladder

  • Familiarity: I've put it through the wringer

I love the style of this bladder and how easy it is to open/close. It also doesn't leak.

Haven't found anything I dislike yet

  • Familiarity: I've put it through the wringer

Basically the title. I love the opening and clasp. Easy to fill up especially compared to watching my buddy fill his camel. No problems with leaks yet.


  • Familiarity: I've put it through the wringer

I purchased this hydration bag to install into my kid-carrier hiking pack. Easy to fill and clean!

Awesome hydration bag

    The platypus 3L fits perfectly into most hydration compatible packs. I use this in my osprey 20L day pack for climbing and does the trick perfect! It is very simple and easy to use and clean! Five stars

    better than most

    • Familiarity: I've put it through the wringer

    I wanted a hydration bladder with a wide opening for cleaning and ice, and had heard these had no taste. The opening is good but I had hoped to be able to turn it inside out for cleaning and the baffle prevents that. The bite valve is not the best. You have to turn it to open it, and that's hard to do on a mountain bike. It leaks if you don't close it. Also the water does not stay all the way to the valve. But the water tastes great!

    Everything I need on the trails

    • Familiarity: I've put it through the wringer

    This bladder offers strength, I can confidently fill this at it's 3L mark, seal it up & hit the backcountry. I have it packed with my camera gear, sleeping bag & other important belongings & I feel safe with this bladder holding my water to keep me alive.

    Fast Drying And Easy To Clean

    • Familiarity: I've put it through the wringer

    I've used my Big Zip bladder for a few months now and it comes with me every time I'm wandering off into the woods. The big zipper makes it easy to fill, clean, and dry. I have nothing bad to say about the Big Zip bladder and the only reason I'm not giving it 5 stars is because the zipper sometimes doesn't zip correctly. Some people say this is a product error but it can easily be avoided if you pay attention to how it zips and flip it upside down to test it before putting it away.

    Fine, but there are better...

    • Familiarity: I've used it several times

    I have list of things I'm not stoked about, on this bladder. I strongly prefer Ultimate Hydration bladders. Read my reviews on them and reach out to me, if you have more questions.

    Great hydration bag

    • Familiarity: I've put it through the wringer

    Got this bag to use mountain biking, and hiking. It hasn't disappointed with repeated use. I would highly recommend this product!

    Platypus Big Zip

    • Familiarity: I've used it several times

    The quick disconnect hose with this bladder is a great feature. This bladder packs up small and the mouthpiece is nice too. Awesome product!