Big Charles, what an excellent idea. Andy is a real digger in his box so having it inside another box is a great idea. He digs so vigorously that I sometimes think he will make a hole right in the bottom of the box!

AntiPam,I have two cats and two litter boxes. More often than not when I scoop, one box has been used for one function (as you put it ) and the other box for the other function. This doesn't happen every day but often enough that I find myself saying...."Hmmmmmm, how about that!"