1.Large opening for easy cleaning & filling: Our hydration bladder has one of the largest opening; 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 water 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 hydration pack water reservoir promotes and is easy to clean 2.Premium quality: The whole 1.5 liter hydration bladder is made of premium material; water reservoir won't 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 3.Remain pefectly hydrated: This 1.5L water reservoir can withstand temperatures from -20 to 50 degrees celsius; the tube resists temperature changes in hot and cold weathers; L 14.1'' x W 6.6'' 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 running 4.Well-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 connector automatically shut off and the hydration bladder will stay filled; store neatly in fridge/icebox without tangling hose Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.