Feature:1. This running hydration backpack is made of extra thick, tear resistant, water resistant and anti abrasion polyester.2. The soft cushion at the back is composed of a porous mesh backrest and a comfortable cushion to prevent stuffiness and release back pressure.3. There are 4 zippered pockets on the back, 1 on the bottom left, 1 on the back, and 1 on the top. It has a large capacity and can hold 15L items.4. There are 2 adjustable length buckles on the chest, and an adjustable shoulder strap that can be adjusted according to your body shape.5. There are open pockets on both sides of the front of the backpack, and a small zippered pocket is attached, so you can equip small items outdoors.Specification:Item Type: Running Hydration BackpackMaterial: PolyesterSize: Approx. 41x20cm / 16x8inColor: BlueCapacity: 15LPurpose: Outdoor Recreation.Package List:1 xBackpackNote:Please allow 12cm/ 0.40.8in error due to manual measurement.