Made of 420D nylon, these innovative cases are specially designed for the gym and fit into a standard locker or beneath an airline seat. Small and large size are available with your choice of expandable or non-expandable. Small size features a 12" height and two dividers. Large size is 16" high with three dividers. Common features include: 1. Detachable shelf inside can be removed completely & held by the elastic loop affix to top of webbing one side. 2. Six elastic pocket at door opening. 3. Mesh pocket & open pocket outside. 4. Foam padded.