Mazama Celilo Dual Cap Top Fill Hydration Bladder, Replacement Water Bladder Fits Most Hydration Pack Water Backpack Applications UPGRADE YOUR HYDRATION PACK: Mazamas replacement hydration bladder fits most popular hydration packs and backpacks from brands like Osprey, Camelbak, High Sierra, Nathan, and more. A BETTER BITE VALVE: Our Celilo hydration reservoir 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, you can rest assured your water is always available and within reach. SIMPLE TO LOAD, FILL, AND USE: Quick connect exit port with auto shut-off makes loading your water bladder a breeze; the dual-cap system features a 55mm  turn fill port and a larger 80mm port for easy cleaning and drying. TASTE THE WATER: Unlike other hydration systems, you'll never get any off flavors with any of our reservoirs. That's because we manufacture all of our hydration pack film right here in the USA; so you can taste water, not plastic. SATISFACTION GUARANTEED: We stand behind our products. We know they are high quality and built to last in the outdoors; but if for any reason you are unsatisfied, return your water bladder hydration system for a full refund.