Mens Large 21" Tactical Gear Molle Hiking Hydration Ready Backpack Daypack Bag Material: 600D High Density Polyester for durable daily use. Black with gray contrast stitching Molle strap system: allows for attachment of external gear; D rings on shoulder straps; Side and "Y" Load compression straps to keep load tight Hydration Ready: water bladder pocket inside main compartment with hose/tube pass through hole at the top Dimensions: 21"L x 12"W x 9"D; Volume: 2600 cu. in.; Padded adjustable shoulder, chest, and waist buckle strap Excellent storage: 2 zippered front pockets, 1 large middle compartment, 1 large main compartment, Organizer with key hook strap