Platypus Big Zip Reservoir (3-Liter) Drink tube and reservoir are lined with polyethylene to create a completely taste-free system and resist bacterial growth. HyperFlow bite valve offers the highest flow rate on the market. Ergonomic shutoff valve is angled at 90 for no-hassle, hands-free hydration. Wide opening and new rounded corners make filling and cleaning easy. 7.5 x 17 in.-19 x 43 cm-4.5 oz.-135 g