SPECIFICATIONS   Color: Yellow, Green, Blue, Red, Black   Capacity: 18L Suitable: Cycling, Climbing, Hiking, Running, Other outdoor sports Model Number: 1013 Rain Cover: Yes Material: nylon Function: Rainproof, Water Resistant, Durable, Scratch Proof, Helmet Holder Origin: Mainland China Gender: Unisex Choice: yes semi_Choice: yes     Name: Outdoor Hydration Backpack     Material: Waterproof nylon  Size: 49 * 25 * 18 cm Color: Yellow, Green, Blue, Red, Black Capacity: 18L Suit For: Cycling, Climbing, Hiking, Running, Other outdoor sports Features: Rainproof, Water Resistant, Durable, Scratch Proof, Helmet Holder   Included (according to your choice): 1 x Water Bag(without backpack) 1 x Backpack (without water bag) 1 x Backpack (with water bag) Disclaimer: About size: Size chart for the reference only, please allow 1-3cm error. About color: Slight color difference may exist under certain circumstances such as screen display resolution variation, different lighting environment etc, which is not expected to be seen as a quality issue.