Petmate® Drawstring Hi-Back Litter Box Liners are made specifially for Hi-Back Litter Boxes and makes controlling odors and cleaning the litter box easy and fast. The unique drawstring hold securely on the pan so that it doesn t slip down when your cat jumps in the litter box. When it s time to change the litter; the liner draws tight for easy; simple; and clean disposal. using a liner in your litter box prevents clumps from sticking to the bottom of the pan and makes the task of changing the cat s litter much easier.