An apparatus for positioning containers on a support surface of a support, the apparatus including an engagement portion constructed and arranged to attach the apparatus to the support and a first portion extending from the engagement portion. The first portion is constructed and arranged to rest on the support surface and enable sliding movement of a container thereon. The container also includes a second portion constructed and arranged to rest on the support surface and enable sliding movement of the container thereon. A stop portion is provided between the first portion and the second portion. The stop portion is constructed and arranged to position the container at a predetermined position on the support surface.