Features 1ADJUSTABLE LENGTH: The straps of the backpack can be adjusted according to the user's height and weight, making it more comfortable for you to use. 2HUMANIZED DESIGN: The top of the pack has a carry strap so you can switch it to a carry handle when your shoulders get tired, or put it on the wall when you're not using it. 3WATERPROOF: The water resistance of the backpack is very good, and you don't have to worry about water leakage in bad weather such as rainy days. 4HOOK AND LOOP: The slip pocket on the back of the backpack is designed with a convenient and quick hook and loop, which makes the loading of items more stable and travels with confidence. 5LARGE CAPACITY: The backpack has a large interior space, which can hold a lot of items in addition to water, which can bring a lot of help to your outdoor sports such as cycling. Specification Item Type: Hydration Pack Material: Oxford Cloth Specification: Free size Package List 1 x Hydration Pack