100% Leak-Proof:2L Hydration Bladder Upgraded 120 Soft Mouthpiece with Easy-to-Operate On/Off Valve to Prevent Leakage. The water flow is conveniently controlled by the bite, and the water does not leak when the bite is not. When drinking water, bite gently while absorbing water. Military Grade Quality:The water bladder 2L is made of high quality TPU material. Odorless, non-toxic and BPA free. The water storage bladder has passed the air pressure test and is fully pressure resistant. Double edge technology greatly improves durability. Perfect Hydration:This hydration pack bladder can withstand temperatures from -20 to 50 degrees Celsius. The tube is resistant to temperature changes in hot and cold weather. Size: 35cm x 7cm, the length of the water pipe is 105cm, the diameter of the spiral opening is 5cm, and ice cubes can be placed. How to clean:For the first time use, we recommend adding citric acid (or baking soda) and water, fill with water, let it stand for 2 hours, and finally rinse with water, it can be completely odorless. It doesn't leave a bad taste in your drink.