I LOVE my arrangement - went to a fabric/hobby shop and bought two big plastic cases that beaders and craftspeople use... LOTS of compartments and little sliders to adjust size., and a nice hinged lid. Holds many flavors of carts separately, bottles, batts, PTs, carrying cases, carts-to-clean, carts-just cleaned, the works. Dunno if JoAnn's Fabric store is national, but they were @ $12 each there. I have way hundreds of carts and stuff, now all nicely organized. I like it a lot better than the tackle box I was using as everything is so easy to see and reach, and better than the big desk organizer, as it has a lid. I keep things dark by just throwing a cloth over it..