The Capezio B163 Smooth Operator Back Pack is not your average back pack. It has stretch side pockets and a external pocket that sits against your back for extra security as well as a mesh front and top section to provide extra ventilation for your belongings. This bag is small enough to fit in a locker but big enough to fit all of your essentials. Made from 100% Polyester. Dimensions are 15" W x 10.5" H x 5.75" D.