A container assembly designed for the collection, temporary storage and transport of refuse, waste material or other objects includes a housing having a hollow interior in which the refuse is collected and stored and a supplementary support structure at least partially defined by a support platform which may extend outwardly from the housing into an operative position to support and have mounted thereon one or more objects or containers of additional refuse material. The supplementary support structure may be retracted into a stored position when the transport of materials on the exterior of the housing is not intended. The housing and hollow interior are at least partially tapered such that at least two container assemblies can be concentrically stacked within one another when the supplementary support structure is in its stored position.