TPU Water Bag Hydration Bladder For Outdoor Sport Running Camping Hiking 1.5 Lnn-- ECO-FRIENDLY MATERIAL,BPA FREE: The whole hydration bladder is made of premium anti-bacteria material. Taste free, non-toxic, BPA free, SGS and FDA certified. This tested to comply with international safety standards. It wonu2019t 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 durablity.n-- LARGE OPENING DESIGN: 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.Smoothness of the liner prevents germ and lime from adhesion, which promotes health and easy to clean.n-- REMAIN PEFECTLY HYDRATED: This 2L water reservoir can withstand temperatures from -10 to 50 degrees celsius. INSULATE.