After using this box, I discovered it has a design flaw. If you have a cat that likes to urinate standing up and points towards the back of the box, the urine leaks out along the back seam. When you take the lid off urine will be on both edges of the back of the bottom and top and a small amount can also leak out onto the floor. Other than that it's a great box, but you should make sure your kitty likes to sit, not stand before you buy this!