Universal cat litter tray bag with fasteners. The Bag it Up bags can be used with the Savic litter trays and toilet homes: Oval Tray Large and Flappy. The bags help you clean the cat litter tray quickly and easily. Moreover, the bags prevent urine scale and unpleasant smells in the cat litter tray. Finally, by using Bag it Up you extend the lifetime of your litter tray or toilet home.