Kitty Liter pan seems to big, mine are like 4-5 inches deep. They are the most average looking 32qts out there by sterilite.
I have 32qt sterilite bin racks, and these kitty litter pans fit pretty good. They even have enough room to sit on top of the litter pan. If you go to walmart and look at the cheapest kitty litter pans they have you will see what i mean.