ScoopFree Cat Litter Bags by PetSafe. These bags are designed to fit into the ScoopFree Clumping Self-Cleaning Cat Litter Boxes and the ScoopFree SmartSpin Self-Cleaning Cat Litter Boxes, making cleanup quick and easy. Simply place the bag in the litter box, and when it's time to replace it, just take it out, tie the string, throw it in the trash, and replace it with a new one. It's that simple! Compatible with the ScoopFree SmartSpin Self-Cleaning Cat Litter Box. Contains 25 litter bags. Easy disposal of litter without the need for a thorough cleaning of the litter box. A convenient and hassle-free solution for a clean litter box.