Your Backpack Review

The lightweight, flexible Platypus Big Zip SL hydration system is totally taste-free and comes complete with a drinking tube and HyperFlow bite valve. Tough enough to stand up to freezing and boiling temperatures, it makes an ideal upgrade or replacement component for an existing hydration pack, and instantly converts any standard pack into a hands-free hydration system. The Platypus Big Zip SL reservoir features a wide opening for easy filling and cleaning. The face-mounted hose port makes it simple to get the reservoir in and out of your pack. The ergonomic 90 degree shutoff valve allows for easy drinking and the HyperFlow Bite Valve delivers a high flow rate which is important when you want to stay well-hydrated while on the go. The entire system is leak-proof. The Big Zip SL has an integrated SlideLock closure that ensures a secure and easy closure. Backed by a lifetime warranty, the durable tri-layer laminate film is extremely puncture and abrasion resistant. The reservoir and the drinking tube of the Big Zip SL feature Platypus’s SlimeGuard anti-microbial treatment to ensure a completely fresh and taste-free system. A quick connect fitting is included that allows you to use a water filter (sold separately) and pump filtered water directly into the Big Zip SL reservoir through the drinking tube. The Platypus Big Zip SL hydration system is available in 1.8L (60 z.), 2.0L (70 oz.) and 3.0L (100 oz.) size options.