After many attempts at organizing, this method has worked best for me. All carts/ overlays/ books are in separate bags and organized in alphabetically order. The letters wrote on the containers are done in copic so if I need to expand one drawer, I can easily wipe with alcohol and rewrite the labels! Very portable and works best for me!!! There are currently 91 carts (okay maybe more!!! ssshhh) in these containers and plenty of room for more!!! These containers are from Target, I also use the same ones for my punches, works like a charm!
So get out there and ORGANIZE!!!!