PREMIUM QUALITYManufactured from high quality TPU flexible food grade material. BPA FREE. Your taste free and odor free hydration bladder has passed a bearing pressure test to ensure it is leak proof and ready use. Double sealing side technique has greatly improved durability LEAK-PROOF TECHNOLOGYUpgraded 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 water reservoir will stay filled non-leaking Silica gel Fastening: LARGE OPENING FOR EASY CLEANING FILLINGThe hydration bladder opening mouth is large enough so you can fill/refill water very easily even without taking it out of hydration backpack. You can also put some ice cubes into water hydration bladder to keep water cool. The big opening allows you reach every corner inside and give your water reservoir bladder thoroughly cleaning. So you can always maintain your drinking water bladder at high hygiene. MULTI FUNCTIONSThe hydration reservoir is suitable for most hydration backpacks. We water bladder bag helps you stay hydrated in outdoor activities: running, skiing, hiking, riding, camping, cycling, climbing, bicycling, etc. It is a must buy for outdoor adventure enthusiasts and a great gift for Christmas/New Year. NO RISK PURCHASE We offer customer satisfaction guarantee. If you have any problem with our hydration bladder, just contact us and we will offer a new one or full refund.