ScoopFree ‘Free’ is a new disposable litter tray made from recycled materials and comes pre-filled with premium crystal litter free of perfumes and dyes. Free trays don’t have a lid so they can nest, making them easier to stack and store in small spaces. Each tray includes a garbage bag for easy disposal.The crystal litter provides superior odor control and the tray includes a covered waste compartment that locks in odors, so you can leave the tray alone for weeks at a time. It is completely disposable for hands-off convenience, so you don’t have to touch or smell messy waste. After a few weeks, simply toss the tray in the provided disposal bag and replace with a new one. Works with all ScoopFree litter boxes, including ScoopFree Original and Ultra self-cleaning litter boxes and ScoopFree Slide manual litter box.