Each pack (a total
of 60 packs) was prepared by placing two steaks (randomly
distributed) in a spanded polystyrene tray (318 · 235 ·
38 mm), which was overwrapped with a high barrier film
of water vapor permeability 1.1 g/m2/24 h at 23 C/50%
RH, nitrogen permeability 2.7 cm3/m2/24 h at 23 C/50%
RH, carbon dioxide permeability 23 cm3/m2/24 h at
23 C/50% RH and oxygen permeability