Supposing you would like to bulk condition your beer in a plastic food grade bucket with lid from the local HB store, could you not glue a layer of Mylar Space Blanket around bucket, lid, and bottom of bucket... that way even though the plastic container is not strictly oxygen impermeable, the oxygen will never touch the outsides of the container because of the space blanket. If space blankets can work as a barrier against hydrogen and helium, then by all rights it should stop oxygen too no?
