Features： 1、Made of high quality Oxford cloth and nylon waterproof material, it is light and wear resistant, and the mesh back is comfortable and breathable. 2、Can prevent sweating and provide comfort. this backpack is the best choice for outdoor sports, including cycling, running, hiking or camping. 3、Adjustable shoulder straps and chest straps make your backpack fit perfectly, will not burden your back during running, prevent moving. 4、Contains water bag, filling water faster, cleaning more convenient, can withstand temperatures of ‑20℃ to 50℃, high quality PP screw cover. 5、The water backpack is designed with double zippers and 3 pockets for easy storage and provides maximum convenience for sports enthusiasts. Specification： Item Type: Hydration Pack Material: Oxford Cloth, Nylon, EVA, PVC Size: Approx. 43 x 22.5cm / 16.9 x 8.9in(The Size is Measured Manually, There May Be Small Deviation) Water Bag Straw Total Length: Approx. 105cm / 41.3in Water Bag Specification: 2L Water Bag Suitable for Water Temperature: -20℃ to 50℃ Do Not Fill the Water Bag with the Prohibition Sign: Beverages, Alcoholic Water, Milk and Boiling Water. Package List： 1 x Hydration Pack  1 x 2L Water Bag  1 x Water Bag Straw