This 200 Round SAW M249 pouch was used in the US Air Force DFLCS Kit. The pouch can hold up to 200 rounds of linked 5.56mm ammo, as well as other bulkier items. You secure the items with an adjustable buckle flap. Also, you can mount the pouch to any MOLLE compatible surface.
This pouch comes as a part of the Defensor Fortis kit.