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  • Platypus - Big Zip LP Hydration Bladder -

Platypus Big Zip LP Hydration Bladder

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101 Reviews


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 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
  • Item #CAS0447

Tech Specs

Cancer -
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

Tech Specs

  • Reviews
  • Q & A

What do you think about this product?

Have questions about this product?

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.

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.

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.

what are the dimensions of these bladders?

Best Answer

Hey Heather,

Here are the dimensions

2.0 L - 7in x 18.5in/weight 5.5 ounces

3.0 L - 7.75in x 18.75in/weight 5.8 ounces

If you have any more questions about this bladder or any other gear, please give me a call at 1-800-409-4502 ext 4446 or email at

Can anyone comment on the flow from the...

Can anyone comment on the flow from the valves between the Platypus and Deuter bladders? I have the UltraSpire bladder, which has great flow, but doesn't maintain pressure, so each time you want to drink you have to suck all the air out first. Terrible design, especially for runners.

may I ask what is the advantage of this...

may I ask what is the advantage of this type of system over a normal water bottle or canteen??just curious..I mean water in your pack equals wet gear and clothing does it not??Im not new to packing,just to all these new gadgets...

Best Answer

A few advantages:

-- lighter weight to hold a larger volume of water

-- The flat nature of the bladder is easier to pack and, when empty, takes up almost no volume in a pack (unlike a bottle)

-- most packs hold these bladders at the ideal location for heavy gear (mid/high, centered, close to the back)

-- the tube makes it easier to hydrate while moving. ("handsfree")

-- The larger volume makes it easier when filtering/purifying water

-- I like to hang mine up on a tree in camp, at which point it becomes a gravity-fed "faucet" for anything I need.

All that said, I usually carry a bladder AND a 16oz insulated bottle. That gives me the versatility I like for drinking like a normal human, hot liquids, sharing, and my bottle serves as a tiny bear canister to store a midnight snack.

I just want to add that most packs these days have a hydration sleeve to keep your bladder separate from the rest of your gear and the only way your gear is going to get wet is if you puncture the bladder which has never happened to me or anybody that I know personally.

David and Wayne highlight great points. Weight is key, and this system is pretty light, even for a bladder. I personally own this system, and it does NOT leak (if used properly, of course). It even has a disconnect between the hose and bladder that allow you to remove/attach a full bladder with little (<1 tsp) to no water loss. I fully trust this bladder to keep everything dry.

its light and you can fit a lot of water in a small area. however you are right it does suck when it leaks and every once in awhile that does happen, and I have had it happen more often with this bag then I have with other bags. however it is always a good idea to keep anything that you don't want to get wet in a dry stuff sack.

Is the material the bladder is made of...

Is the material the bladder is made of resistant towards boiling water, or will it change size due to temperature?

I have never put boiling water in my own platypus, but the people in the thread below seem to say they have had no detrimental effects from putting boiling water in theirs. sounds like you should be set to go.

will this fit in my clik elite camera...

will this fit in my clik elite camera pack

Hey Steve, we didn't carry that Click Elite Pack, so I checked around online. I'm not sure exactly which model you have. If it was the Express model with the computer sleeve for 15" Laptop or iPad, you will have ample room for any of the 3 sized Platypus bladders.

The description of this bladder says "A...

The description of this bladder says "A quick-disconnect fit on the end of the Platypus Big Zip SL Hydration Bladder's drink tube means you can easily remove the water reservoir from your pack without re-routing the drink tube"... so does that mean I *don't* need to purchase the quick-disconnect kit ( ) in order to tidily disconnect the hose from the pack? ie... it's already set up as is?

Best Answer

Correct. No need to by the quick disconnect seperado. The disconnect that is sold separately is to modify other hydration bladders to have a disconnect valve at the base of the bladder. But this bladder already has one.

I have this backpack -- http://www.sears...

I have this backpack -- but would like a 3L bladder. would this one work?

Best Answer

If you plan to use the built in bladder pouch, the 3L bladder is going to be too large. If you want to keep it in the large compartment and aren't concerned with it moving around a bit, it would fit. I think you'll likely have a bit of trouble fitting a 3L in the designated pouch no matter which bladder you go with.

Can I use the new magnetic bite valve from...

Can I use the new magnetic bite valve from my Osprey bladder with the Platypus Big Zip SL. Love the Osprey pack - don't like the bladder expect for the value. If I could make this switch this would make for hydration heaven... Thanks

Ok, Whats the secret to freezing water in...

Ok, Whats the secret to freezing water in the Platypus Bladder without freezing up the water flow in the quick-disconnect valve?

Best Answer

maybe place it in the freezer with the disconnect valve up. Then when you remove it, run the disconnect valve part under some warm/hot tap water to thaw out anything that might have frozen inside? Just a thought though. Haven't tried it.

From the Platy site:

How do I freeze my Platypus bottle or reservoir? Is it ok to freeze my Platy? bottle?

Lay it half-full on its side in freezer with all air purged. Do not over-fill. Water expands as it freezes and this can burst your reservoir or bottle.

Unanswered Question

What size is best for Salomon Hydra Revo...

What size is best for Salomon Hydra Revo Backpack?

Can anyone tell me the weight of the 3L...

Can anyone tell me the weight of the 3L bag only? Excluding the hose and the clip thingy at the top. Trying to save some grams from a gravity works setup and i think this would replace the dirty bag quite nicely asa it's a bit lighter. thx

It's going to be difficult to get an exact answer on this because most people don't have a scale that reads that low. I'm sure it doesn't weight more than an ounce or two. It is just a thin plastic bag so the weight will be negligible.

can you use the insulator hose accessory...

can you use the insulator hose accessory with this?

Absolutely! The Platypus Insulator Tube was made to be used with the Big Zip SL Hydration Bladder. It will also work with the Platypus Hoser Hydration Bladder. It's easy to install and works well to insulate in weather above 20 degrees F.

Other than duct tape can you make repairs...

Other than duct tape can you make repairs to this hydration pack? I have a pinhole leak after the first trip. Gy

Best Answer

You can use a repair kit made for a water bed or air mattress, but a better idea, if you can live without it for a week or two, is to take them up on their lifetime warranty. Cascade Designs warranty dept- 800-531-9531

how do you dry this damed thing out?

how do you dry this damed thing out?

Take the cap off of a spray paint can, cut the end off the cap so that you have a cylinder open on both ends, then stick the cap into the bag's opening. This will hold the bag open better than any other method. Set it upside down for a bit so that most of the water drains, then clip it to something to hold it upright to dry the rest of the way.