In World War Two the US Airborne had special Rigger made ammunition pouches which allowed them to carry more ammo and equipment on the webbing sets than the standard issue magazine pouches.
The Rigger pouches where made in various sizes and where worn by the paras on the pistol belts with other standard issue webbing.
The medium rigger pouch will hold either 5 x M1 Garand rifle clips or 6 x M1 carbine magazines or 2 x Pineapple hand grenades.
Made of canvas webbing with a single pull the dot fastening.
Colour: Khaki/tan which is officially called OD#3. (This is not the dark green colour which came in towards the end of the war).
See below for other sizes of rigger pouches.