Fits a 2 liter cyclone bladder with tube (not included, but can be purchased at your local sports store) * Large brushed nickel O-ring for hanging items * 2 adjustable load compression buckle straps: keeps your load compact and tight. Includes 39 mini loop straps for hanging items * Rear padded air mesh panel for maximum comfort, wide padded adjustable air mesh-lined shoulder and waist buckle straps for perfect fit and comfort * 1 small side pocket, 2 zippered side loading main compartments, 1 zippered side loading water bladder pocket with hanging hook and access hole at the top for the tube, polyester top handle for hanging or carrying the shoulder bag, 1 inner mesh open pocket, measures 13.5"W (at bottom, 7"W at top) x 18.5"L x 6"D and is made of 600D polyester