Abstract: A tray contains a bag of litter and provides four sides to form a litter box. An enclosure folds into a flat configuration against the top of the tray. In use, the panels of the enclosure unfold and form an enclosure for the tray. Closure panels fold upwardly from the tray and interlock with the unfolded panels to add stability. The closure panels are provided with openings to allow the ingress and egress of cats. When desired, the panels can be folded back into the flat configuration and the entire unit disposed of.