The Modkat Litter Liner is reusable with effortless removal and emptying. Constructed of commercial-strength tarpaulin, which is rip-resistant and a snap to clean! The liner is extra tall with a fitted band keeping it snug to the perimeter of the box. It's designed to fit perfectly inside the Modkat Litter Box, which means you'll never see an ugly protruding unfitted liner again. We highly recommend using organic or all natural clumping litter with our liners.