Item Type: Hydration Backpacks - Closure Type: Velcro - Hydration Backpacks Capacity: 3L - Water Bladder Bag : 3L - Material: Nylon + TPU - Size: Approx. 43 x 18cm (L*W) 16.9inch*7.1inch - Backpack Usage: Normal Camping & Hiking - Compact and lightweight multi-function backpack. Waterproof and Durable Hydration Backpack is crafted with waterproof nylon fabrics so it’s durable, Being made of anti-bacteria TPU materials so it’s safe. Bladder system can be removed and cleaned. Features: - Equipped with a tube with a bite valve to drink, you do not have to hold it to drink. - Constructed with waterproof 900D Nylon material, the backpack is wearable and durable. - Completed with a switch on/off bite valve, it’s convenient for you to control the flow of water. - With the adjustable shoulder strap and chest strap, it’s suitable for heavy carrying and secured enough so that will not distract you when you do some exercises.