a defined amount of oxygen in its headspace and product portion whereby products packaged in the same are stable in the absence of oxygen scavengers application_number US 18761408 A description the only limitation with respect to the flexible material used to make the packaged product of the present invention is that the material employed is suitable for use with consumable products and able to yield a headspace permeation rate f and a product portion permeation rate f whereby f f does not exceed 0 03 and preferably is between from about 0 01 to about 0 02 illustrative and non limiting examples of the type of flexible material suitable for use in this invention include those comprising polypropylene nylon ethylvinyl alcohol polyethylene polyethylene terephthalate polycarbonate and polyvinylchloride as well as blends and co polymers thereof the flexible material suitable for use may also be a combination of polymeric films including a combination of polymeric films that have as a film layer and preferably a middle film layer a metal foil such as one comprising aluminum such materials may be purchased from suppliers like united states plastic corp valeron strength films plastic film corporation and curwood inc in a preferred embodiment the material comprises polypropylene metal foil and polyethylene terephthalate in yet another preferred embodiment the flexible material and product are substantially free of radical scavengers i e less than 0 2 by weight based on total weight of the flexible material and less than 0 2 by weight based on total weight of the product and preferably free of radical scavengers when preparing or assembling the packaged product of the present invention the flexible material may be heat sealed and or sealed with food grade adhesives like retortable adhesives a product filling device which may.