Each specific polymer has unique physical mechanical, chemical, and gas barrier properties. Unlike glass or metallic packaging materials polymeric films are permeable at different levels to small molecules such as gases, water and organic vapour, and to other low molecular weight compounds like aromas, flavour and additives present into food. The chemical composition and properties of plastics can be designed to provide optimum permeability to gases and water vapour to extend the shelf life of specific fruits and vegetables. As a consequence of the permeability properties. the barrier of films ranges from high to low. The degree of film permeability is crucial to maintain gas and moisture. Additionally, the manufacturing, handling, and package engineering operations can influence the final properties of packaging films.