The Tamrac MX5383 M.A.S. Flash Accessory Pocket - Medium (Black) is a 600 denier Ripstop PolyTek nylon, foam padded pouch for flashes such as; Canon's 430EX or Nikon's SB-600 & SB-800 or light meters. It has a front pocket that provides enough space for batteries or other flash accessories. It is part of the M.A.S. (Modular Accessory System) and quickly attaches to compatible products or to any belt. It has a carry handle and a belt loop.