Platypus Big Zip EVO Reservoir 3L. 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. Specifications for Platypus Big Zip EVO Reservoir: Manufacturer: Platypus Age Group: Adults Fabric/Material: Silicone Polyurethane Features of Platypus Big Zip EVO Reservoir 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. HyFLO Self-sealing Bite Valve: Improves flow along with new larger 5/16in drink tube. Funk-free: Embedded Silver-ion protects clean water from mold and bacteria. Pure Platy Experience: All materials are certified taste-free BPA-free BPS-free and phthalate-free. Package Contents: Platypus Big Zip EVO Reservoir Platypus 10857: Big Zip EVO Reservoir 3L