Like other reviewers said...it only fits a small litter box.  One cat size box.  In our family we have 4 cats and probably 6 boxes scattered throughout (all in a furniture type box) so it works.  the top of the box is a perfect size for a small bench in mudroom.  We use it for a cat feeding station in laundry room.  Easy to put together.  Holes are large enough for cat to get in and out.