Abstract: A product packaging system includes a packaging element for receiving a first product, wherein the packaging element is fabricated from a convertible commodity. The first product is selected in combination with the selection of the packaging convertible commodity. The packaging convertible commodity is delivered to an end destination. The selection of the first product in combination with selecting the convertible commodity is embodied in an Optimization Program. More preferably the Optimization Program is executable by a computer. Also disclosed is a product packaging tray which can be stacked without need for an outer carton. A tray enclosure can be provided with a means for regulating and controlling the environment within it. The packaging system optimizes the use of packaging as a product and the shipped airspace.