Description: Backpack is made from highly durable, 900D Oxford cloth material abrasion-resistant ,scratch-resistant, waterproof. -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. 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. Molle System throughout the bag and appearance very convenient for adding additional pouches. Wide application: Great for hiking, camping, climbing and other outdoor activities. Specification: Material: Oxford Fabric Size: 38x25x15cm/14.96x9.84x5.91inch Package Includes: 1 Piece Hydration Backpack Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!