Abstract: A container having a standard storage space is operatively associated with an adapter having a connecting means thereon to permit the adapter to be connected on the container so that in assembled position the adapter will expand the size and volumetric capacity of the storage space of the container a predetermined amount. The adapter is essentially a shaped annular member which defines an auxiliary storage space of predetermined volumetric capacity has a connecting means made from material having a memory which is formed on the inner surface to enable the adapter to be mounted about the open end of the standard storage space to add thereto the predetermined volumetric capacity of the auxiliary storage space when the adapter is in assembled position on the container.