Abstract: A rust-preventive firearm receptacle comprising a water-vapor-impervious material cover defining a cavity, a vapor-phase anti-rust inhibitor insert with active vapor-phase anti-rust inhibitor, a soft interior, including a pocket attached to the interior for replaceably receiving the insert, and a tape device mounted about the perimeter of the receptacle to seal the interior cavity thereof from outside air. The invention is generally used by placing a chemical carrier insert into the cavity pocket such that when the firearm is carried within the sealed cavity of the receptacle, it is surrounded by the vapor-phase inhibitor emanating out of the insert. When inactive, the insert can be replaced.