This back pack is four bags in one! It can be worn as a backpack, move one of the straps over and wear as a sling pack, move the straps to the two anchors on the top and wear as a cross body bag, or a bucket bag. The outside of the bag is cotton or canvas and has an exterior zipper pocket and slip pocket. The inside is canvas and has a interior zipper and slip pocket with a key holder. A vinyl bottom protects against dirt and moisture. The top has a draw string closure with a clip to keep it closed. All metal hardware and vinyl straps will make this bag your favorite for a long time.