Line shaft roller conveyors form a modular system to transport product in either WIP boxes or card cases from the packaging system to the case sealing and palletisation area. Belt and modular belt conveyors are integrated for elevating and merging or sorting cases. The modular nature of the systems allows simple modification and expansion to systems. The systems are built from standard parts so maintenance and modification is simple. Systems can be designed to merge multiple streams of product to convey to the palletisation system to be re sorted into dedicated product streams.