Compatible with most popular packs, the Backflip 3-Liter Hydration Reservoir features an easy-to-fill flip cap with a push button release. A lock switch ensures leak-free performance. The made-in-the USA film is taste-free and durable. Includes a quick connect exit port for the drink tube and high flow bite valve with magnet retainer. UPGRADE YOUR HYDRATION PACK: Mazama’s replacement hydration water bladders fit most popular hydration packs and backpacks from brands like Osprey, Camelbak, High Sierra and more. A BETTER BITE VALVE: Our BACKFLIP hydration bladder includes our proprietary high-flow bite valve so you get water when you need it; and with a one-handed push button shut-off and super magnet retainer. SIMPLE TO LOAD, FILL, AND USE: Quick connect exit port with auto shut-off makes loading your water bladder a breeze, while the lock enabled flip-cap design makes filling simple with one push of a button. No need to twist or fumble with odd closures while still being leak-free and durable. TASTE THE WATER: Unlike other hydration systems, you’ll never get any off flavors with these bladders.