Luca Storage Extra Module - WhiteIntroducing Luca Storage Extra Module, which can be easily stacked, so you can build the piece of furniture to the height you need for storage. The Luca Storage Module can easily be expanded by adding the Luca Storage Extra Module. The modules are stacked on each other with an interlocking design system insuring the pieces do not slide or fall off. Once stacked the modules are easily locked to each other and there is hardware included for wall