Introducing the Big Zip EVOthe latest evolution in taste-free hydration. The Big Zip EVO delivers a significantly higher flow rate than previous Platypus reservoirs and a host of new features, making it a great option for backpackers, hikers, and mountain bikers. Available in 1.5L, 2.0L, 3.0L and a Lumbar 2.0L.Secure SlideLock:Slides both directions to easily open, securely close and fill reservoir.Handy Pincher Grip:Allows for easy one-handed filling.High Mount Quick-disconnect:Offers fast, easy accessno more digging down in your pack.Leak-proof Shut-off Valve:Instantly stops flow and offers reliable stowing.Semi-rigid Center Baffle:Offers low-profile support and makes for easy cleaning and drying.HyFLOSelf-sealing Bite Valve:Improves flow along with new, larger 5/16″ drink tube.Funk-free:Embedded Silver-ion protects clean water from mold & bacteria.Pure Platy Experience:All materials are certified taste-free, BPA-free, BPS-free, and phthala