The present invention generally comprises an apparatus for transporting containers between a first transport system and a second transport system. In one embodiment, the first transport system comprises a ceiling-based conveyor and the second transport system comprises a floor-based conveyor. The present invention may further include storage shelves, preferably substantially horizontally aligned about a common vertical plane with a section of one of the transport systems. The transport system may be located either directly above the uppermost storage shelf or beneath the lowermost storage shelf in order to add storage capacity within the fab. A vertical module transports containers between the transport systems and the at least one storage shelf.