The Produce Marketing Association has developed recommendations for case bar coding formats to support the produce packing house track and trace initiative. The components of the bar code are a manufacturer/product code and lot code embedded into a bar code that follows GTIN bar code recommendations. Currently most packing houses utilize either pre-printed cases with the product bar code pre-printed on the side of each case. Since the lot code is variable this solution will no longer work. The packing houses need to implement on-line case coding system. The two possible solutions are high resolution ink jet or a labeling system.