Genuine US military surplus M1956 Vietnam Era butt pack adapter straps. The cotton field pack adapter strap assembly attaches to the M56 suspenders which allow the butt pack to be worn on the back, rather than on the pistol belt. Attaches to M1956 suspenders to attach a butt pack or any additional gear too.
These straps are in great condition, however due to their age you will likely see some oxidation on the metal components.