Comment on DIY Kitty Litter Box by Liz.
I bought a large plasric bin with wheels on one end. left the bin upright so it will roll. I cut a hole in the end. I put a cat bos inside. I leave the lid off. The box is on my lanai. When I have company I can put the lid on and roll the box out of sight on another side of the lanai. The litter stays inside the bin The litter is easy to scoop. This arrangement has worked well for ears.