I improved on the 30 gallon tote kitty litter box! Inside I put a high side flat bottom kitty litter box. It fits perfectly width wise but is about 5" shorter. I push it all the way to the back and keep a folded towel between the door and the smaller box. Now when my big boy goes into the smaller box and pees towards the door it all goes on the towel which I change easily. No more washing rugs everyday and my other arthritic cat can still get in easily. Woo Hoo!