Item Type: Hydration PackMaterial: Oxford Cloth, Nylon, EVA, PVCSize: 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 / 41.3inWater Bag Specification: 2LWater Bag Suitable for Water Temperature: -20 to 50Do Not Fill the Water Bag with the Prohibition Sign: Beverages, Alcoholic Water, Milk and Boiling Water. 1Made of high quality Oxford cloth and nylon waterproof material, it is light and wear resistant, and the mesh back is comfortable and breathable. 2Can prevent sweating and provide comfort. this backpack is the best choice for outdoor sports, including cycling, running, hiking or camping. 3Adjustable shoulder straps and chest straps make your backpack fit perfectly, will not burden your back during running, prevent moving. 4Contains water bag, filling water faster, cleaning more convenient, can withstand temperatures of ?20 to 50, high quality PP screw cover. 5The water backpack is designed with double zippers and 3 pockets for easy storage and provides maximum convenience for sports enthusiasts.