I recently changed my method of storage for Cricut cartridges. I loved them in the original boxes until I got too many to store and access easily. Next, Leslie made me a "suitcase" that held the books in the bottom and velcroed the cartridges on the lid. That worked well also--until I got too many to store in that system.
So, now here is the latest storage solution which I like the best. The cartridges are held in a floss sorting plastic container available in about all crafting stores. I purchased mine at Hobby Lobby (but have also purchased them at Michael's and Joann's) for I believe about $2. It was found in the crafting area. There were also some in the sewing/floss aisle for about $5. Apparently, they cost more if you are going to store floss in them! You can store 36 cartridges in one case and then you have to quit purchasing carts. Yeah, right!
The keypad is stored inside the book and the books are set up right in this Sterilite container also purchased at Hobby Lobby. It may have been on sale at the time but was around $5. It measures about 5 1/2" high, x 8" x 13".
Then, the floss box will fit inside the large box on top of the books and everything is together and easy to carry.