Poly bags used were made of polyamide 20m–polyethylene 70m with ethylene vinyl alcohol (EVA) sealant layer.Oxygen and carbon dioxide permeability were 5.8×10−9 and 1.7×10−8 mLm−2 s−1 Pa−1 (both at 23 ◦C and 0% RH), respectively, and water vapour transmission rate for the poly pouches was 3.2×10−5 gm−2 s−1 (at 23 ◦C and 85% RH).