LARGE OPENING FOR EASY CLEANING & FILLING Our hydration bladder has one of the largest opening on the market. The big opening makes for easy pouring of water. It is also fairly wide for a hand or bottle brush easily access to the interior hydration bladder. The 4 screw on cap goes on and off easily. For cold water, simply add ice cubes directly from a scoop or refrigerator ice dispenser. The smooth inner of water reservoir promotes health and is easy to clean.PREMIUM QUALITY The whole hydration bladder is made of premium material. CHERAINTI water reservoir is taste free,, SGS certified and 100% food grade. This tested to comply with international safety standards. It wont leave a bad taste in your drink. The water bladder passed pneumatic pressure test, it is pressure-tolerant. Double sealing side technique has greatly improved durability. Might be the most rigid hydration bladder on the market.REMAIN PEFECTLY HYDRATED This 2L water reservoir can withstand temperatures from -20 to 50 degrees Celsius. The tube resists temperature changes in hot and cold weathers. L 14.2'' x W 6.8'' hydration bladder is compatible with most hydration packs. The tube (0.4 diameter, 40 long) provides a wholesome flow for easy drinking, keeping you hydrated when biking, cycling, hiking, or runningWELL-SEALING WATER BLADDER You won't be slowed down with our high flow bite-valve. Simply bite the mouthpiece to suck water. Soft mouthpiece with easily accessible ON/OFF valve. It also has a cover to keep dirt out. Conveniently control the water flow by biting. Quick-release tube is detachable. While the tube is removed, the connnector automatically shut off and the hydration bladder will stay filled. Store neatly in fridge/icebox without tangling hose.QUICK AFTER-SALES SERVICE - Quality is our top priority, we take all customers satisfaction very seriously. ANY reason, if our water bladder for hiking backpack dont live up to your expectations, please feel free to contact us. We are always here to help you assist all of your concerns.