M-1961 VIETNAM BUTTPACK, MINT Mint Condition!M1961 Field Pack, Combat. Canvas. Butt pack, buttpack, fanny pack...all of these terms originated in Vietnam when this pack was put to the test. All are Vietnam Issue, most dated 1962 or 1963,but date stamp and manufacturer will vary. While these are new, mint condition, never issued; some will show very, very minor signs of storage and or shelf wear. Each pack includes it's original manual entitled "Heavy Hints for Light Packs".