Since the sizes of meat counters in self-service supermarkets have been reduced to an absolute minimum the distribution of meat and poultry, fish and several types of convenient-food are sold in plastic trays under modified atmosphere to give the products a longer shelflife. New systems of distribution made packaging of fresh food, and in particular the packaging of poultry, meat and meat products, fish, and dairy products an absolute necessity. The demand for transparent food trays took off when consumers accepted packaging as necessary part of the product to keep it fresh before distribution. For the last twenty years the distribution of most fresh products sold in self-service corners in supermarkets has been common in plastic trays with sealed lidding on the top and attached labels to give the buyer necessary information. Consumers never thought about differences in plastic, necessary barriers or other particularities because they bought convenience, freshness and products safely packed under best conditions. Up to now transparent PLA trays have been no more than a niche sector in the fresh food packaging business.