Backpack is made from highly durable, 900D Oxford cloth material abrasion-resistant ,scratch-resistant, waterproof.<br> -light water storage bladder bag is portable enough.It can be put compactly in your hydration vest. Great backpack reservoir replacement for kids and adult.<br> Drinking water by the soft bite valve directly without stopping your steps or taking off your running backpack. Convenient hydration reservoir for your outdoor Marathon, Running, Hiking, Cycling, Climbing.<br> Molle System throughout the bag and appearance very convenient for adding additional pouches.<br> Wide application: Great for hiking, camping, climbing and other outdoor activities.<br> Specification:<br> Material: Oxford Fabric<br> Size: 38x25x15cm/14.96x9.84x5.91inch<br> Package Includes:<br> 1 Piece Hydration Backpack<br> Note:<br> 1. Please allow slightly error due to manual measurement.<br> 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.<br> 3. Wish you a wonderful on-line shopping!