Big Zip LP

Deluxe hydration system with low-profile reservoir.

Nothing makes hydration easier than the Big Zip LP hydration system. Our premium reservoir comes with an easy-to-clean wide-mouth opening and a low-profile design that fits the back panel of any pack.

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Nothing makes hydration easier than the Big Zip LP hydration system. Our premium reservoir comes with an easy-to-clean wide-mouth opening and a low-profile design that fits the back panel of any pack.
  • Wide-mouth opening with Slidelock closure is easy to refill and locks securely.
  • Low-profile design rides flat in your pack.
  • Taste-free as well as BPA-, BPS-, and phthalate-free.
  • Embedded silver-ion protects reservoir from mold and bacteria.
  • Quick-release hose and shutoff valve make drinking and refilling easy.
Made in U.S.A. of U.S. and Imported Materials
2 LTR 3 LTR 1.5 LTR
Color No No No
Capacity (Standard) 70 fl. oz 100 fl. oz 50 fl. oz
Capacity (Metric) 2.0 liters 3.0 liters 1.5 liters
Weight (Standard) 5.6oz 6oz 5.4oz
Weight (Metric) 0.16 kg 0.17 kg 0.154 kg
Width (Standard) 7.9 in 8.8 in 7.9 in
Width (Metric) 20.0 cm 22.3 cm 20.1 cm
Length (Standard) 15.6 in 17.2 in 13.4 in
Length (Metric) 39.5 cm 43.7 cm 34.0 cm
Spout material Polyethylene Polyethylene Polyethylene
Bite valve material Silicone Silicone Silicone
Country of Origin Made in U.S.A. of U.S. and Imported Materials Made in U.S.A. of U.S. and Imported Materials Made in U.S.A. of U.S. and Imported Materials
No. All Platypus hydration products are 100% BPA- and BPS-free, and are made with durable urethane and food-grade, taste-free polyethylene interiors.
Use hot, soapy water and rinse thoroughly with hot water. For tough cleaning jobs, add 1/4 cup of baking soda to 3/4 cup of water per liter volume of your bottle or reservoir and shake for 30 seconds. Add 1/4 cup lemon juice, shake 10 seconds, and vent by loosening cap away from face. Repeat shaking and venting three times. Expel as much air as possible, cap bottle, and allow to soak 20 minutes. Rinse three times with hot water. Caution: When adding lemon juice to baking soda, effervescence occurs and will cause pressure to build in a capped Platypus product.
Platypus bottles can be dried by blowing a little air into them to expand them and letting them stand uncapped until the water evaporates. Hang Hoser™ reservoirs from their carry loop to dry. Drying Big Zip™ reservoirs is easy, with a dishtowel through the large opening. Then prop them open with the SlideLock slider and let them air dry. Another great way to dry all reservoirs and bottles is with a plastic bag dryer, widely available at kitchen supply stores and numerous online retailers.
You can put a variety of beverages in your Platypus bottle or reservoir. Just make sure you clean it thoroughly after each use to prevent bacteria from growing in the reservoir and/or tube.
To disinfect, fill the reservoir or bottle with a solution of unscented household bleach and water at a concentration of 2-5 drops per liter of water. Close and mix for 10 seconds. Fill hoses and bite valves by squeezing bite valve, being careful to keep valve over sink. Leave filled overnight. Rinse thoroughly and air dry. For a more planet-friendly alternative, use a chlorine-free, hydrogen peroxide-based bleach alternative like Free and Clear™ available from Seventh Generation®.
A frozen Platy bottle makes a great ice pack and, during the dog days of summer, delivers a steady source of cold, refreshing hydration. 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.
Does your hydration system have a shutoff valve? If so, it may be closed. Open it by twisting the bite valve 90 degrees (Clockwise closes it, Counter-clockwise opens it). If that doesn’t work, you may be biting the valve too hard. The Platy HyperFlow Bite Valve is designed so that you don’t need to bite very hard. If you bite too hard the flow will be completely cut off. With your teeth, compress the valve lightly (only 30% to 50%) and water should flow.
The best way to restore a snug fit between the bite valve and the drinking tube is to remove the bite valve from the drinking tube. Next, cut a small section off the end of the drinking tube. Clean the bite valve and hose with rubbing alcohol, lick the end of the drinking tube and place the bite valve back on the end of the drinking tube. After it dries, there should be an excellent seal.
Using our Bite Valve & Drink Tube Insulator is an easy solution to deter freezing. Additionally, to help prevent the water in the reservoir from freezing, start off the day with warm or hot water in the reservoir, then pack your extra clothing layers around it. To help keep drink tubes and bite valves from freezing up, sip often to maintain flow, and, after you’ve finished drinking, blow any residual water back into the reservoir. Also, even if you are using the Bite Valve & Drink Tube Insulator, it still helps to keep as much of the drinking tube covered as possible, such as routing it inside a pack, strap, or jacket.

First, remove your HyperFlow™ bite valve by pulling straight out and off the hose. Then simply slide the cover onto the hose and reattach your bite valve.

Yes. Periodically adding a little Vaseline to the tracks will keep them supple and easy to close. Wipe away excess Vaseline to keep it from getting in your water and to prevent it from collecting dirt. In the field, a little lip balm or similar item can do the trick.
Absolutely. Simply turn your reservoir upside down after filling it. Then simultaneously squeeze the reservoir and the HyperFlow bite valve until all the air is purged. Bye, Bye sloshing.

E-mail: Cascade Designs Service Center
Tel: 1-800-531-9531

Yes. Simply remove the bite valve on your hydration system and connect the end of the hose directly to your filtration system’s outflow port. Using a GravityWorks™ filter system, your reservoir can take the place of the supplied Clean reservoir, creating what is arguably the lightest, most compact and efficient way possible to get water. GravityWorks™ filters are available with direct-to-reservoir and direct-to-bottle adapters for optimum versatility.
Scott B.
February 18, 2017
Yes, I would recommend this to a friend
Big Zip LP is a big win!
A fantastic hydration system that works in every pack I have. I love the lower profile reservoir that still holds 3 liters of water and doesn't cause my pack to "rock" back and forth on my back as I walk. The hose connections are great. Especially the cut-off at the bottom of the bag that doesn't leak when you disconnect the hose. It keeps me from having to reroute the hose at every refill. The fill opening is very easy to use and I have not had a single issue with leaking even when sitting on my pack, directly on top of the reservoir. I am not a light dude (275lbs) so the fact that the closure holds is no small feat. The bite valve and lock are easy to use, even when wearing gloves. Overall, I am very satisfied with the system so far and plan to buy 3 more of them for my family.
February 18, 2017
Yes, I would recommend this to a friend
Big Zip 3.0L
Purchased this for a rock trip to Brasil. It is an amazing hydrator... assembly is literally a snap ad your off! I looks like the best one I've ever owned!
October 10, 2016
Yes, I would recommend this to a friend
The best bladder i have seen
I bought my Big Zip LP 3.0 over five years; it is still going strong. There are several features i love: -The zip closer it awesome -The quick disconnect is great, and allows the hose to swivel, and not kink -As light / compact as cheaper / thinner bags -Durable plastic and construction -Resistant to mold / discoloration -I like the 'tall' design of the older model. If my pack is shorter, i just don't fill the bladder all the way, and fold over the top. I do think the water has more of a plastic taste than it used to, but after five years, i can deal with it. I hope the design and quality continues

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