-Water Bladder Back Pack offers you an optimal solution to the drinking water problem -You carry it on your back and the tube runs as close to your mouth as you can get it without becoming inconvenient -No matter what you’re doing (hiking, biking, climbing, etc.) there is no slowing down or stopping necessary -As long as the drinking tube to stays in place then it’s a grab, drink, and go, goes go! -Built-in with a water bladder, easy to add water ; just open the cap of water bladder -Waterproof Durable Materials : Constructed by waterproof 600D high-density Nylon material, tear-resistant, abrasion- resistant and durable -Large filling port with secure seal. Bite valve design, convenient for switch on/off the flow of water -Equipped with a tube with a bite valve to drink, so you don’t need to stop and hold it to drink -Humanized Design : Slender and portable design with middle handle strap, adjustable webbing chest strap and shoulder straps, partaking the load when carrying heavy loads -Adjustable Shoulder Strap/Chest Belt : With hand carry strap and adjustable shoulder strap, so you can adjust it to the most comfortable position, suitable for heavy carrying and longtime exercise, walking Package Weight: 380g Package Dimensions: 25cm x 54cm