The AO-633 is designed for use with XL-2B or similar bottom-mount batteries. Extra height is designed into the case frame to accommodate for the power-sources underneath the 633 mixer/recorder. Please use the AO-1 for alternative power sources that are not located under the 633 unit. The AO-633 Audio Organizer Case with Audio Harness is a 1000 denier Cordura nylon case with a rigid plastic frame and interior padding in the main section and pocket. It is designed to carry the Sound Devices 633, wireless microphones, transmitters, batteries, cables, connectors, and other equipment. There are velcro side openings for complete access to cables. The case has cable ports on each side so cables can be routed into all exterior pockets for snag free wiring versatility. The case is transported by suede leather-covered carry handles. It has multiple metal "O" ring attachment points for optimized balance. This Audio Organizer comes with an Audio Harness to make carrying and transportation easier and more comfortable.