I have one cat who sprays, and I've tried all sorts of things - a high sided plastic storage box (not quite high enough), placing the lid of a storage box against the wall (the pee can seep off into the carpet and what if he uses the OTHER end of the box)? I bought a Flip because I also have older cats who I didn't think could navigate the Modkat, but was concerned that Kirby might walk in and spray out the opening. He DOESN'T, and it is a delight. I'll be replacing all my boxes with Flips.

- Nancy