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The left side (front) shows how I cut plastic canvas to make dividers that interlock, as well as how the dividers fit together in the container (back). I cut three long dividers, and four short ones. This gives me room to store up to 15 cartridges, with room enough in the same container for the overlays. I keep the handbooks in a separate container. Notice how the handbooks are kind of staggered in the container. Snapware containers snap/lock together, so I can snap the cartridge/overlay container on top of the matching handbook container, and keep them together; or I can snap multiple cartridge containers in one stack and handbook containers in another stack. I tend to do the two stacks. They have a handle on the lid of each stack, so they're easy to carry if needed. It works well for me, and it's pretty quick and easy to find the cartridge I want, since I store them in alphabetical order. I used a fine point Sharpie to write the name of each cartridge on the top so I can see the names without pulling them all out.