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  • Platypus Big Zip LP Hydration Bladder
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PlatypusBig Zip LP Hydration Bladder
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Item # CAS0447

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Item # CAS0447

Big Zip LP Hydration Bladder

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 odors from creeping into your refreshing drink.

  • 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 odorous material from growing in bag
  • Angled shut-off valve prevents water from leaking
  • Made in USA with imported materials

California Proposition 65


Cancer -

Tech SpecsWeight
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
Recommended Use
hiking, running
Manufacturer Warranty

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

[1.5L] 5.4oz, [2L] 5.6oz, [3L] 6oz

Reviews & Community


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Easy to fill, dry & clean

  • Familiarity: I've put it through the wringer

The wide zip top makes it easy to fill, dry and clean out. Easier than any other brand. The snap attachment for the hose is a great feature. It makes it super easy to replace any part that may wear our over years of use (hose/bite valve).

4 stars since you actually have to pay attention to closing the zip component. As mentioned below, do a quick inversion test to check you sealed it correctly.

Good hydration bladder

  • Familiarity: I've used it several times

This is the 3rd brand of hydration bladders that I have used, and it is the easiest to fill and close securely. I will still do a quick inversion test to make sure it's not going to leak, haven't had a problem yet. It's also the easiest I've used when it comes to cleaning it so I'm more willing to use electrolytes for more strenuous hikes. Only issue is the bite valve takes more effort to get water out, but according to other reviews I've read it just takes some breaking in.

The best

  • Familiarity: I've put it through the wringer

So much easier to fill compared to Camelbak bladders. Have not experiencing any leaking since putting it through the wringer. The quick disconnect works great and water flows easily through the mouthpiece.

Works great

  • Familiarity: I've used it several times

This bladder is super easy to fill and doesn't leak. The bite valve takes a couple uses to break in. But otherwise It's fantasic.

Worker Bladder

  • Familiarity: I've used it several times

Well designed hydration bladder. Easy to open, close, fill, and doesn’t leak. Nice wide mouth to fill either at the fridge or the lake with a water filter. Swivel tube exit helps longevity of the bladder. Use this on runs and bike rides with my dog - helpful to squeeze mouth spigot to shoot water her way, too.

I Don't Understand The Good Reviews

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

This bladder is a joke - I have never been so disappointed in a product before. Yes, it is easy to fill but that is about it. My main issue is the bite valve which turned out to be a struggle for me to get water flowing through the hose no matter how I bit down. My boyfriend tried it too and he was unsuccessful as well. Then, as I was hiking, water started to leak all over me - I couldn't get water out of the hose and now it's flowing freely? I closed the valve (a feature that works if you are not using the bladder) but to be honest, as I am hiking up a mountain and I am using poles, I don't want to be constantly shutting the valve on and off when I need a drink. I got so frustrated, that I ripped the valve off and used straight from the hose every time I needed water. Plus, I had read online that you can blow air into the bladder for it to sit upright and air out - not true at all. Unless I wasn't executing the process correctly, the bladder would not stay inflated or upright.
I am going back to my Camelbak that I should have never left in the first place - where the bite valve works and you can hang upside down to dry.

Good Water Bladder

  • Familiarity: I've used it several times

Overall, I think this is a great product. However, the first one I order had a faulty seal, which I discovered at home, thankfully. Had an easy return and replacement. I have since purchased two others that have been solid performers, no leaks. Just make sure to test it at home before using... but I would say that about any critical piece of gear.

A refreshing change.

  • Familiarity: I've used it several times

I lost the lid to my Camelbak, and it has seen a lot, so I was going to simply replace it. Then I figured why not try something new? I know that lid will show up eventually, and then I'll just have two Camelbaks, and that's silly. Nothing wrong with my Camelbak, it's never let me down, but the Platypus is a nice change. Why? It's easier to fill, it tastes less like plastic, and I like that the mouthpiece refuses to leak even if you forget to lock it. Plus you can detach the hose, and I like the clear look to this bladder as opposed to the blue alternative. I'm happy!

My favorite

  • Familiarity: I've put it through the wringer

Probably the best designed hydration bladder I've come across. Much prefer the zip-lock style opening to the circular ones. My friends always have a tough time filling their circular opening bladders, but there's never a problem with the Platypus.

Simply the Best

  • Familiarity: I've put it through the wringer

Easy to clean and fill. This doesn't have the plastic taste that I constantly had with my camelbak. Highly recommend

Hiking Companion

  • Familiarity: I've used it several times

I love water bladders because I hydrate significantly better than if I have to stop and open a water bottle to drink. I had a Platypus that has been through the wringer, multiple years of constant use, over multiple continents. The baffling on this one threw me off a bit, but it still has the easy clean, detach hose, and fill features I love. I'm looking forward to using this bladder for many, many trips to come!

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.

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.