Nesting retail packages within external liners may minimise temperature fluctuations and thus diminish water condensation in the package and reduce the risk of microbial spoilage. On the other hand, addition of another plastic layer would increase the overall barrier properties of the nested packaging towards water vapor, as compared to the retail package alone. Therefore, in addition to thermal isolation provided by a twolayer structure, sufficient water vapor permeability of both plastic layers is required in order to prevent condensation inside nested packages.