Abstract: A file cabinet construction includes at least one shelf mounted within a housing having parellel opposed side walls and a rear wall. A number of guide rails are mounted at predetermined positions along the shelf so that they are parallel to the side walls of the housing. Each guide rail has a longitudinal slot extending into the guide rail from the end located nearest to the rear wall of the housing and terminating at a point adjacent to the forward edge of the shelf. A boxlike container which includes opposed parallel longitudinal sides and a bottom having a longitudinal channel is detachably mounted on each guide by a floating pin. The floating pin is mounted so that the longitudinal axis of the pin is transverse to the channel in the bottom of each container.