Large opening, easy to clean and fill - our water bladder has one of the largest openings on the market.The large opening makes filling with water easier.The width of the hand washing brush or bottle washing brush is also very large, so that it is easy to enter the inner hydration bladder.The nut is easy to tighten and unscrew.If the water is cold, simply place the ice cubes in the spoon or ice maker directly in the refrigerator. The smoothness of the inner tank prevents bacteria from adhering. Provide better moisturizing effect - this 2 liter water tank can withstand temperatures from -20 to 50 degrees Celsius. The insulated pipe can withstand temperature changes in hot and cold weather.Provide healthy mobility, easy to drink and stay hydrated while biking, biking, hiking or running! Leak-proof - our high-flow bite valve won't slow you down.Simply bite the nozzle to absorb moisture. A soft nozzle with an easy-to-use ON/OFF valve prevents leaks.It also has a dust cover.Control the water flow conveniently by biting.If you don't bite, water won't come out.The quick release tube is removable.After removing the hose it closes automatically, the airbag is still full and leaking