a product tray having shrink - wrapped plastic stacked , shipped and sold on pallets due to an improved design made from a single blank of cardboard or other package material . such improved product tray resists horizontal shifting and prevents vertical stack failures when exposed to horizontal forces during shipping . each improved product tray supports a comparable compressive load while being composed of less material or less expensive material as compared with prior art designs . such improved product trays may be stacked , shipped , and sold on pallets without first packaging them into boxes , and without the substantial additional labor normally required for trays made according to the prior art , at warehouse club stores and other outlets .