【ODORLESS MATERIAL, INSULATED TUBE】All parts of the hydration bladder are made of food grade material which is FDA certificated. The military hydration bladder is thicker and durable. The material is smooth inside and able to keep water clean. The water bladder has superior quality TPU drinking tube with no odor. An insulating sleeve is added to reduce the temperature change of the water flow that running thru the tube from hydration reservoir 【LEAK-PROOF TECHNOLOGY, QUICK RELEASE TUBE】The hydration bladder tube is easy to connect and disconnect with one hand. The shutoff valve will automatically close and won’t leak without connecting tube. Without the tube connected you can easily and quickly refill the 2l hydration bladder, no worry about it leaking all over the place. We applied highest military grade double-edge sealed technology onto the insulated water bladder to make sure the whole bladder is leakproof and pressure tolerant