This clumping original features clay particles that bond together when soiled, guaranteeing that only used clumps are tossed, along with the odors. This clumping formula creates solid clumps that don't crumble or break when being scooped out. All usable litter remains in the box to keep litter changes and any extra dust to a minimum. Carefree, indeed. Available in 16lb Jug or 25lb, 40lb or 50lb bags.