These were designed to hold essential medical supplies for soldiers in the field. Items may have included gauze, bandages, antiseptic wipes, and pain relievers.
The canvas on this Model-2 pouch is in very good condition, but does have some stains. The front is marked "U.S.". It is also maker marked and dated "G.B. MFG. CO. Inc. 1944". Contents can be seen in photos. All containers may or may not have contents, some are still sealed and some are not. The condition varies.