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  • Platypus - Big Zip LP Hydration Bladder - One Color

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  • Platypus - Big Zip LP Hydration Bladder - One Color

Platypus Big Zip LP Hydration Bladder

$34.95 - $36.95

Free 2-Day shipping on orders over $50*

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    • One Color, 2L
    • One Color, 1.5L
    • One Color, 3L

    82 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 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
    • Item #CAS0447

    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

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    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.


    • Familiarity: I've used it several times

    I bought this after I had a camelbak 100oz reservoir start leaking. I was first going to buy another Camelbak until I saw someone using a Platypus bag at this concert I was at. I checked it out and immediately loved how small it can fold down into and how easy it is to refill and close. I also really like how the hose clicks in and attaches to the bag and that the bag doesn't leak when the hose is off it. There's no taste to the water unlike what I found with the camelbak after having the water sit in there for a few hours. It's super easy to slide the handle off, unlike the hassle found when trying to twist off/on the camelbak top. Overall I love this reservoir and would probably stick with this brand from now on.


    • Familiarity: I've used it several times

    I brought this in my pack on a week-long elk hunt in Colorado. Never really heard of these things before but did a little research on options and chose this. I loved how easy it was to satisfy my thirst without removing the pack each time; one fill lasted me a day and a half in hot (for September) weather. I hung it in a specifically designed pocket. The bladder fills with out spilling due to the wide mouth. It cleans well for the same reason. Another thing I like about it is how small and light it is to pack when not in use. Thank you Platypus.

    Best Hydration Bladder Ever

    • Familiarity: I've put it through the wringer

    Used this bladder on a 8 day backcountry trip, it worked flawless, the wide mouth is perfect for easily filling it up, and holds plenty of water for long multi day trips. Added a quick disconnect to fill it without taking it out of my pack, highly recommend it!

    Big Zip? Genius!

    • Familiarity: I've used it several times

    Why hasn't anyone thought of this? This is the only kind of bladder I would spend money on. The function is amazing. Tip it upside down when you first fill up and you will see. Easy to put in ice if you are going out for the day and want to keep cold. And as far as cleaning goes it couldn't be much easier. I leave mine in the freezer when im not using it so as to keep it as clean as possible so that the moisture wont get the bladder clean.

    Big Zip? Genius!

    I'm glad I bought it!

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

    I've only had the Platypus Big Zip 2L for a short time, but so far I'm very happy I bought it. I always thought hydration bladders would make the water taste like plastic. But, I see more and more hikers using them so I decided to try it. The bag seals great and there is no plastic taste to the water.

    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.

    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

    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?

    How much does this bladder weigh in each...

    How much does this bladder weigh in each size?

    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.

    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

    can you use the insulator hose accessory...

    can you use the insulator hose accessory with this?

    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

    what are the specs for the 1.8L

    what are the specs for the 1.8L

    Is there somewhere to clip on to the top...

    Is there somewhere to clip on to the top to hang in my pack?

    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.