1. A method for filling a container and providing a longer shelf life for a commodity packaged in said container wherein said container has a finish with an opening at one end for attaching a closure, a generally tubular body adjacent to said finish, and a base adjacent to said body that closes off an end of said body opposite said end of said body adjacent to said finish, wherein said closure has a member protruding into said opening, said method comprising the steps of: preparing the container for filling; filling the container with the commodity to a surface level; allowing a headspace above said surface level sufficient to generally minimize spillage of the commodity while handling the container without the closure; attaching the closure wherein the member displaces a portion of gases in said headspace; and storing the container filled with the commodity.