In conventional, non-perforated polymeric films, the flow of gases across a barrier film increases with increasing concentration gradient between the package headspace and surrounding environment. This gradient creates the driving force for gas diffusion through the polymeric film produced by the reduced O2 and elevated co2 resulting from the actively respiring produce (Mir & Beaudry Equilibrium levels of o2 and CO2 are finally achieved in the package when the rates of o2 uptake and co2 production by the packaged produce are equal to that permeating through the film, a situation favoured by steady-state (constant) RR. The diffusion rates of CO2 and O2 through perforated and non-perforated polymeric films differ (Mir Beaudry, 2004). For non-perforated film significantly diffusion rate of CO2 is between 2 and 8 times faster than O2. This gives a wide range of permeability ratios of CO2TR to O2TR (referred to as B), which are always higher than the recommended optima values for most fresh produce. Due to unequal permeability rate between O2 and Co2 of most of commercially available films, their B values lie within a range of 2.2-8.7. Such low o2 and lhigh Co2 permeability is undesirable for suitable application in the MAP of most minimally processed produce that require the selected film to match their high respiration rates (RRs).