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• 3L Lager Capacity: 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.
  Switch ON / OFF Bite Valve: 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.