This is a MSAP side plate carrier pouch from Eagle Industries. You can use the pouch to to mount side armor ballistic plates to the outside of your body armor. Also, it doubles as a great admin pouch. The pouch has MOLLE webbing on the front for mounting accessories. There is a hook and loop field for attaching patches and other items. You secure the side plates and other items in the pouch with a hook and loop flap.