PREMIUM QUALITY Made of high quality food grade TPU flexible material. BPA-FREE. Your tasteless and odorless hydration bladder has undergone a pressure test to ensure it is leak-proof and ready to use. Double side sealing technology has significantly improved durability LEAK-PROOF TECHNOLOGY Upgraded soft mouthpiece with easy-to-reach ON/OFF valve prevents leakage. Easily control the water flow by biting, when you don't bite, the water will not leak out. The quick-connect hose is removable. Automatic shut-off when the hose is removed, the water reservoir stays full and does not leak. Silica gel Synthetic LARGE OPENING FOR EASY CLEANING AND REFILLING The water reservoir opening is large enough so that you can easily fill/refill water even without taking it out of the hydration backpack. You can also put some ice cubes in the water reservoir to keep the water cold. The large opening allows you to reach every corner inside and give your water reservoir a thorough cleaning. So you can always keep your drinking water container with high hygiene. MULTIPLE FUNCTIONS The water reservoir is suitable for most hydration backpacks. Our water reservoir helps you stay hydrated during outdoor activities: running, skiing, hiking, riding, camping, cycling, climbing, biking, etc. It is a must-have for outdoor enthusiasts and a great gift for Christmas/New Year. RISK-FREE PURCHASE We offer customer satisfaction guarantee. If you have any problems with our hydration bladder, contact us and we will offer a new one or a full refund.