I saw today a display that had a heavy cloth bag, about the size and construction of those re-usable cloth bags people use in supermarkets, stamped with the legend “Ammunition Bag M1” It was sort of an off-white to gray color, and appeared to be made of duck or canvas, with a strap. No idea of age, maybe WWI or WWII. Due to the M1 designation, it would likely be U.S., but it had no other military markings that I could see.
What would this be intended for, by whom, and when? First guess would be for use by ammo porters to carry bandoliers of rifle ammunition or belted MG ammunition in combat, but it could be about any kind of ordnance, I guess - hand grenades, demolition explosives, artillery primers, whatever. If for such a purpose, I’d think a man could carry more than one of them at a time.