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This product is no longer available, but don't go just yet.


  • Lightweight, puncture-resistant, 3-ply plastic laminate is lined with food-grade polyethylene that won't flavor your water with a plastic taste
  • Durable welded construction lets you boil, freeze, inflate and collapse the bag over and over again
  • Reservoir is lined with SlimeGuard™, an antimicrobial treatment that keeps water fresh and taste free
  • SlideLock with secondary reinforcement ensures a secure and easy closure every time
  • Drinking tube assembly includes HyperFlow™ bite valve, providing one of the highest flow rates on the market
  • Quick-connect hose allows easy removal of reservoir from pack without rerouting tube
  • Taste-free tube won't affect the flavor of your water
  • Platypus Big Zip SL features an ergonomic shutoff valve that is angled 90° for no-hassle hydration

Made in USA.

View all Platypus Reservoirs

REI membership


Best Use Hiking
Bite Valve Shut-Off Switch Yes
Wide-Mouth Opening Yes
Quick Disconnect Tubing Yes
Material(s) Polyethylene
Dimensions 14.75 x 7.25 inches
BPA Free Yes
Weight 5.5 ounces
Liquid Capacity (fl. oz.) 60 fluid ounces
Weight - Metric 0.16 kilograms
Liquid Capacity (L) 1.8 liter