OneTigris TPU Hydration Bladder Bicycle Camping Hiking Climbing Water Bag High-grade environmental-friendly TPU material, with FDA certification Foldable design, easy to carry and store Fits most hydration backpacks-molle & tactical vests, use as a replacement or for adding hydration to a compatible pack Perfect for outdoor use such as hiking, cycling, camping and so on Can be used to store water with -20 to 50 degree Celsius