well, I think maybe they would try to stand ON the saran wrap. I have things that will fit in the toilet and hold litter, but probably not the weight of a cat. Keep in mind it has to be removeable too since we only have the one toilet. I told Grant it's his job to think of something cause he's an engineer and all, but he has no faith in our cats being smart enough to be potty trained, and thus is putting minimal effort into this project.