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  • Wide-mouth opening with Slidelock™ closure is easy to fill and locks securely
  • Low-profile design rides flat in your pack
  • BPA-free polyethylene with silver-ion antimicrobial finish offers clean, taste-free drinking
  • Quick-release hose and shutoff valve make drinking and refilling easy

Made in USA.

View all Platypus Reservoirs

REI membership


Best Use Multisport
Reservoir Capacity (fl. oz) 101
Bite Valve Shut-Off Switch Yes
Wide-Mouth Opening Yes
Quick Disconnect Tubing Yes
Material(s) Polyethylene
Dimensions 17.2 x 8.8 inches
BPA Free Yes
Weight 6 ounces
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Will this work with the REI Crestrail 70 Pack?

Asked by: PrestonEsco
The Big Zip LP 3 Liter Reservoir will fit in your REI Crestrail 70 Pack.
Answered by: REIservice
Date published: 2016-06-23

I recently bought this and have used it for a long hike. How do I clean the hose?

Asked by: LBP
The Platypus Cleaning Kit is the best choice for cleaning your Big Zip LP Reservoir. The kit comes with a brush for scrubbing your hose. Platypus will have step-by-step cleaning instructions on their site.
Answered by: REIservice
Date published: 2017-04-07

I have both an Osprey Exos 48 and REI flash 18.  I know it will fit the Osprey but will it fit the REI flash 18 if I only fill it 1.5L to 2L full?

Asked by: ongnoimay
Yes, you can carry this reservoir in a Flash 18. By not filling it full, you will keep the weight down, which will make it easier to carry in the stripped down Flash 18.
Answered by: REIservice
Date published: 2015-09-20

What is the tube made of?

Asked by: GaryB
The reservoir tube is made from polyurethane. The bite valve is made from silicone.
Answered by: REIservice
Date published: 2015-09-20

Will the 3 litre fit in the Osprey Atmos 65 AG ?

Asked by: Ddub59
Yes, this 3-liter reservoir will fit nicely into the hydration sleeve.
Answered by: REIservice
Date published: 2017-03-01

How easy is it to disconnect the hose and use the bag as water transport? I have an 80 L backpack and am planning a week long hike in the Grand Canyon with limited access to water. I will carry my 2L Platypus reservoir in addition to this one.

Asked by: Charlie
​The hose can be easily removed with the quick-release function so it can be used to simply transport water.
Answered by: REIservice
Date published: 2017-02-24

Will the Platypus Big Zip LP Reservoir - 3 Liter fit well in the sleeve of an Osprey - Atmos 65 AG?

Asked by: allenratta
The Platypus Big Zip LP Reservoir will fit well in the Osprey Atmos 65 AG.
Answered by: REIservice
Date published: 2015-09-20

I purchased the Big Zip about 2 or 3 years ago. Is this version BPA free? Thanks!

Asked by: EJ1234
The version you have is BPA free.
Answered by: REIservice
Date published: 2016-11-30
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