Feature:1. Adjustable shoulder straps make your backpack perfectly fit your back without moving.2. There is a sponge cushion on the back, which helps to reduce the burden on the shoulders.3. Two-layer pocket design. One pocket is used for water bags, and the other pocket is used for keys, compasses, mobile phones, etc.4. The reflective strip design makes it safer and more convenient to travel at night.5. Made of light and breathable mesh fabric and high-quality nylon fabric, light and comfortable, durable.Specification:Item Type: Hydration Backpack Material: Mesh+Nylon+SpongeProduct Color: Silver Product Weight: Approx. 192g / 6.8oz Package List:1 xBackpack Note:This type does not contain the water bag.