Jonny Cat Heavy Duty Jumbo Litter Box Liners, 5 count; Jonny Cat Heavy Duty Litter Box Liners are the thickest, strongest branded liner in America. The convenient drawstring makes tossing the litter out easier. These liners are heavy-duty and tear-resistant, so cats' claws can't rip 'em. Made with thick plastic that prevents odor-causing waste from sticking to the sides and bottom of the litter box. Just pull, close, and toss!