the tray forming part of the invention has a bottom wall 12 provided with a pair of slots 14 at each side , as seen in fig1 . an outer wall 16 is foldably connected to the bottom wall 12 at one end and to a bridge panel 18 at its opposite end . attached to the bridge panel 18 is inner side wall 20 having a pair of tabs 24 at its free edge . end walls 32 extend from the remaining two edges of the bottom wall 12 . each end wall 32 has a of corner flaps 34 extending from the side edges . closure flaps 42 extend from each end wall 32 and have a pair of side flaps 46 . the top of the closure flap is slightly peaked in the middle and a pair of top flaps 48 extend from the top edge . formed in the top edge of the closure flap 42 is a pair of tabs 50 . to assemble the tray from the blank into the erected condition , end walls 32 are folded up with corner flaps folded perpendicular to the end walls and over the bottom wall 12 . after outer side walls 16 are folded up , the inner side walls are folded downwardly until tabs 24 engage slots 14 . when this is done , corner flaps 34 are captured between the inner and outer side wall . the two fold lines on either side of bridge panel 18 facilitate the folding of the inner side wall 180 ° from being coplanar with the outer side wall to the final orientation . closure panels 42 are folded inwardly to form the top of the tray with side flaps 46 folded inwardly to align against inner side wall 20 . the blank for making the enclosure is seen in fig2 . the blank has a pair of bottom panels 62 each having a pair of bottom flaps 80 foldably extending from the side thereof . a base panel 64 with base flaps 84 extends from the side edge of each bottom panel . foldably connected to the base panel 64 is side panel 66 bisected by fold line 68 . forming the middle of the blank is top panel 70 bisected by fold line 72 and provided with notches 74 for reasons that will be explained later . when the enclosure blank is formed together with the tray , the bottom panels 62 lie against bottom wall 12 with base panel 64 lying against inner side walls 20 . with bottom panel 62 perpendicular to base panel 64 , slot 86 in base flap 84 engages notch 82 in bottom flap 80 to lock two flaps together . side panel 66 extends between the inner side wall 20 and side flaps 46 . fold lines 68 allows the sidewalls to fold in an accordion - like manner and lie against the closure flaps 42 . when folded , the upper section of side panel rests upon the lower section . extending across the folded side panels 66 and across the top of the tray is the top panel 70 . this folded , compact configuration is seen in fig3 . transformation of the device from the flat configuration to the useable configuration is clearly shown in fig3 . fig3 a shows the enclosure transformed from the flat configuration to the fully formed configuration with the intermediate state shown in phantom . as can be seen , the side panel 66 , originally lying against the top 42 of the tray is unfolded until the two sections of the side panel 66 formed by the bisecting fold lines 68 are coplanar . the fold line 72 in the top 70 allows the formation of a peaked top . once the enclosure is fully formed , the two closure flaps of the tray can be raised . the first closure panel 42 is raised until tabs 50 engage the notches 42 , as seen in fig3 b . the second closure flap 42 is pulled all the way through the enclosure in order to access the cat litter stored within the tray , depicted in fig3 c - 3 e . the cat litter , usually packaged in a bag , is emptied into the tray . thereafter , the closure flap is pushed upwardly until the tabs 50 engage notches 74 , as seen in fig3 f . after use , the closure flaps 42 can be pushed inwardly until they again rest on top of the tray and the enclosure can be collapsed back into the flat configuration for disposal . [ 0023 ] fig4 shows an alternative embodiment of the blank for making the tray . all similar parts have been identified with the same reference numerals and only that structure which differs from the first embodiment will be described . in this embodiment , corner flaps 34 have been replaced with a corner fold 134 formed by two panels connected to one another and between the side and end walls . the free edge of the inner side wall 20 is provided with notches 124 as will be described hereinafter . extending from the side edges of inner side wall 20 are wall flaps 122 , 124 . each of these is provided with slots 126 . the two wall flaps 122 , 124 differ in their orientation of the slots 126 as , when assembled , slots 126 of the flap 122 face downwardly with slots 126 of flap 124 extending upwardly . the slots align with one another and allow the two flaps to interlock . also differing from the first embodiment , one closure flap 42 is provided with a large opening 144 for cats with the second closure flap 142 provided with a smaller opening 146 for kittens . [ 0024 ] fig5 shows the second embodiment of the blank for making the enclosure . in this embodiment , bottom panel 62 is provided with bottom flaps 180 having l - shaped cut 182 . base panel 64 is provided with base flaps 184 with an l - shaped free edge 186 . when the enclosure is folded , bottom flap 80 is perpendicular to base flap 84 and the l - shaped free edge engages l - shaped notch 182 to interlock the two flaps . between bottom panel 62 and base panel 64 are notches 188 which complement notches 124 to provide some degree of interlocking between the tray and enclosure blanks when folded . the tray and enclosure are preferably made of degradable material such as cardboard . the blanks are provided with a coating , such as plastic or paraffin , to render the material waterproof . while the invention has been described with reference to a preferred embodiment , variations and modifications would be apparent to one of ordinary skill in the art . the invention encompasses such variations and modifications .
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 .