We finally (between my husband, my son and me) finally got this thing stretched over the plastic frame, but it tore on the seam at one of the corners.  You have to lift up the heaving litterbox to put inside of it--it won't slide in or out over the connecting rods in the bottom.  Soooooo, you can imagine how easy to clean it is--NOT!  A two piece design with the top that would fit over the box with a bottom sheet that snapped onto the top piece would be a better design.