We've got lots of Hot Wheels. No really, lots and lots of Hot Wheels. (NO, REALLY! My husband collects them so we've got boxes and boxes of Hot Wheels in the house and shed.)
Will's own collection has already outgrown two cases. The solution? A shoe organizer. Now Hot Wheels does make its own over-the-door storage solution but this plain one can hold triple the cars (and is cheaper so I won't mind replacing as needed*). It's very easy for Will and Joseph to see which car is parked where. And easy for the boys to help park the cars at the end of the day. Win-win.
*Will has learned that the bottom pockets will not hold his weight. He gets a chair now instead.