** 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. **Note*: *1. In order to avoid water leak; before using the water pack; please screw the tube with bladder. *2. Do not overfill the bladder with water; and tighten the back lid to prevent water flowing out. *3.Please allow little differences due to manual measurement. *4.Please allow little color variation for different display setting. *Specifications*:
