Stacked storage bins

Claim 1

A PLURALITY UNITARY PLASTIC STORAGE BINS ADAPTED TO BE STACKED ONE UPON ANOTHER WHEREIN EACH OF SAID BINS CONSISTS OF A BOTTOM WALL, SIDE WALLS, A REAR WALL AND AN UPWARDLY AND FORWARDLY SLOPING FRONT WALL EXTENDING UPWARD TO APPROXIMATELY ONE-HALF THE HEIGHT OF SAID SIDE WALLS THEREBY PROVIDING AN ENTRANCE PASSAGE INTO EACH OF THE STACKED BINS WHICH ARE POSITIONED BELOW THE TOPMOST OF THE STACK, A CONTINUOUS OUTWARDLY OFFSET UPWARDLY EXTENDING FLANGE ON THE TOP EDGES OF SAID SIDE WALLS AND SAID REAR WALL PROVIDING A CONTINUOUS INTERNAL SHOULDER ON SAID SIDE WALLS AND SAID REAR WALL, THE REAR PORTION OF SAID FLANGE WHICH IS ON SAID REAR WALL BEING OFFSET A GREATER DISTANCE THAN THE PORTIONS OF SAID FLANGE ON SAID SIDE WALLS WHEREBY THE INTERNAL SHOULDER ON SAID REAR WALL HAS A GREATER WIDTH THAN SAID SHOULDERS ON SAID SIDE WALLS, SAID INTERNAL SHOULDER ON SAID REAR WALL HAVING A PIN EXTENDING UPWARD THEREFROM AT A POSITION SUBSTANTIALLY INTERMEDIATE THE LENGTH THEREOF AND SPACED FROM SAID REAR PORTION OF SAID FLANGE, EACH OF SAID BINS HAVING A RECESS EXTENDING UPWARD IN THE BOTTOM WALL THEREOF ADJACENT THE REAR WALL THEREOF AND POSITIONED A DISTANCE FORWARD OF A VERTICAL LINE THROUGH SAID PIN, SAID PIN BEING COMPLEMENTARY TO SAID RECESS, SAID BINS WHEN STACKED AS AFORESAID HAVING THE BOTTOM OF ONE BIN RESTING ON SAID CONTINUOUS INTERNAL SHOULDER OF THE NEXT LOWER BIN AND THE PIN ON SAID NEXT LOWER BIN REGISTERING IN SAID RECESS OF SAID ONE BIN.