Very nice WWII US Army Transport Bag (used for carrying different items e.g. ammo). You can find similar example here WWII US Army Engineers Equipment Transport Bag (08/08/2009) , however more common are examples presented here http://militaryitems.com/store/index...ducts_id=24655
As you can see then, lot of the US Army equipment was manufactured and delivered by British factories. So called "British made" are less common than "US made", however one can find them on the market.