Pack, stack, and go! The STACK Modular Storage System offers the ultimate in-cross system connectivity. This lockable system includes 3 tool storage essentials: a mobile cart, toolbox, and an organizer. The lower cart with telescopic handle and 7-inch wheels is great to move your larger tools from place to place. The middle toolbox offers versatile storage options and gives you the ability to easily transport your tools. The upper organizer keeps smaller items and accessories in order. Combine all storage units with very little effort into one system or customize according to your requirements ? the choice is yours.