These are incredible pieces of war memorabilia. These are USGI Soldier issued and will show varied signs of use. ALL WILL HAVE MARKS, BUMPS OR MINOR COSMETIC ISSUES, but are perfectly useable. They are empty and are surplus bags. The picture is a stock bag, and yours will be very similar. It comes complete with adjustable carry sling and adjustable straps on front of bag. Also had Alice clips on back for wearing on a belt. These use a fastener clip that date dates to the Post Vietnam War era and they are made from rubberized canvas type material.
These carried spare barrels for the M240 machine gun. This gun was developed in 1977 and is still used today! They could possibly be used as sheaths for machetes, as shown in the picture. (Machete not included, only shown for size and use ideas.)