Options for this item: Colour:Light gray Applicable Gender: Neutral / Both Men and Women Capacity: 36-55L Applicable Scene: Open Air Sports Commodity: There is a water bag compartment in which various standard water bags can be loaded in the bag. Closed and preserved; Adjustable chest belt, adjustable waist belt; Velcro is made of nylon products that can adapt to various challenging environments; All of the zippers are designed with double zipper elciks, which greatly prolong the service life and are more suitable for use; Main Bag: 30*22*50cm front bag: 34*7*20cm side bag: 12*7*22 cm