This backpack is a personal anti-theft portable locker. It is excellent for anyone who has ever worried about leaving their belongings when on the beach or playing sports. It consists of two main parts, the soft interior backpack, and the detachable hard cover. This detachable hard shell's design makes it possible to easily wrap and secure this backpack around any type of pole or railing. A 3 feet long retractable cable locking system keeps the backpack securely held onto a structure. The soft interior can be used separately and is machine washable.