A genuine U.S. Vietnam War era M1961 2^nd pattern Field Pack also known as a 'Butt Pack' due to its location when used. Excellent unissued condition with some light storage related marks, top plastic ID holder is in good shape with Alice clips to the back, front U.S. ink marking. DSA (Defense Supply Agency) contract markings and is dates its manufacture to 1963. Made from OD7 duck cotton and features a small carry handle, rubberized waterproof throat lining inside, side webbing plus a row of eyelets to for attaching hook gear like machete sheath or bayonet scabbard.