Bags covered by this specification are intended for use in specialized military methods of preservation. The barrier materials, from which these bags are constructed, are all approved and are military unique. They provide the necessary attributes to protect items from exposure to the extremes of the navy/naval aviation environment. There are no commercial equivalents that can provide similar protection. Specifically, MIL-STD-2073-1, Methods of Preservation 43 and 53, utilize these bags in order to provide specialized military preservation.