EmeraldGreen, you and your husband are genuis'!!! I have plastic garbage bags taped to the box on 3 sides and then taped to the wall (box is in closet) to keep the over achiever pee'rs from perfecting their craft! I will get those large storage containers and leave the lids off of them. I might have to build something to have the kittens step up on temporarily.

What a great thread I stumbled into.