Large Opening for Easy Filling & Cleaning: 2L hydration bladder has a large opening to fill easily, where you can also add ice cubes. The big opening allows you to reach any corners inside and clean the stains without effort. Strong Durability: This hydration pack bladder can withstand temperatures from -20 to 50 degrees celsius. The tube resists temperature changes in hot and cold weathers. L 38 x W 17 CM/15'' x 6.7''. Water bladder is compatible with most hydration packs. The tube (1CM/ 0.4'' diameter, 105 CM/41'' long) provides a wholesome flow for easy drinking, keeping you hydrated. Easy to Drink : You won't be slowed down with our high flow bite-valve. Please notice that the bite valve is the "bite and suck valve". Firstly, pull the valve in the "on" position. Then put it in the mouth, bite the groove gently with your teeth, sucking the valve at the same time. It will pop open and fluid flows freely. PREMIUM MATERIAL: All parts of hydration bladder made of premium material, which is no plastic taste and safe for drinking. With dust proof cover design, absolutely keep it clean. The smoothness of the liner prevents the lime from adhension, which promotes your health. Leakproof: The threads for the screw cap fit the water bag perfectly and the double sealing side technique seal greatly to avoid any leaking. Upgraded 135°soft mouthpiece with easily accessible ON/OFF valve prevents leakage. Conveniently control the water flow by biting, when not bite, the water will not leak out. Quick-release tube is detachable. Auto shut off while the tube is removed, the 2 liter water reservoir will stay filled non-leaking.