MY cat and I are so pleased with this standard litter box. It fits beautiful  in her new Freda Cat home litter enclosure. One problem, the top  lid  is easily knocked off as it fits but does not click onto the bottom litter tray, in her litter box enclosure it has not been a problem, but this would be a problem on its own. Pity, as its high sides are great for the kitty who  kicks its litter around, but bits nicely constructed, and easily cleaned.