Stackable molded plastic containers

Claim 1

A CONTAINER FOR THE SHIPMENT OF PERISHABLE PRODUCE COMPRISING: A UNITARY BODY MOLDED OF LOW DENSITY EXPANDED PLASTIC MATERIAL AND HAVING A BOTTOM AND FOUR SIDE WALLS, SAID WALLS BEING GENERALLY NORMAL TO THE BOTTOM, ADJACENT WALLS BEING GENERALLY NORMAL TO EACH OTHER, AND DEFINING A SPACE FOR SAID PRODUCE, THICKENED PORTIONS AT THE JUNCTURE OF EACH OF SAID SIDE WALLS CONSITUTING CORNER POSTS, SAID CORNER POSTS EXTENDING UPWARDLY AND OUTWARDLY FROM SAID BOTTOM TO THE TOP OF SAID WALLS AND PROTRUDING OUTWARDLY FROM THE JUNCTURE OF SAID SIDE WALLS, SAID SIDE WALLS AND CORNER POSTS TERMINATING IN LIPS WHICH EXTEND OUTWARDLY AND UPWARDLY FROM SAID SIDE WALLS TO FORM A PROTECTED LEDGE AROUND THE INTERIOR CIRCUMFERENCE OF SAID SIDE WALLS, SAID LEDGE HAVING THE DIMENSIONS OF SAID BOTTOM WHEREBY SAID LEDGE CAN NEST THE BOTTOM OF ANOTHER BODY FOR STACKING OF BODIES, SAID LEDGE AND LIPS HAVING SLOTS FOR VENTILATION, AND SAID SIDE WALLS AND BOTTOM HAVING MUTUALLY INTERSECTING SLOTS FOR VENTILATION AND DRAINAGE.