Case, Small Arms Ammunition - The small arms ammunition case is designed to accommodate three 30-round Magazine, Cartridge [NSN 1005-00-921-5004] used with the Rifle, 5.56 Millimeter, M16A1.
It is constructed of nylon duck and webbing with polyester sheet stiffeners in the front, rear and lid of the small arms ammunition case. Each cartridge magazine is held in place by means of 3/4-inch [1.91 cm] wide webbing spacers which cross the top of the small arms ammunition case. The lid is closed by means of a plastic latch.
Grenade carrying pockets are located on each side of the small arms ammunition case which are secured by means of a nylon web strap and metal snap fastener.
A tab with a metal eyelet is located at the top back of the small arms ammunition case to which the individual equipment belt suspenders are attached. The small arms ammunition case is attached to the individual equipment belt by belt-strap keepers with interlocking slides. Source: Wikipedia
