A bag or bag-like transport container or delivery container that can provide a high degree of thermal insulation. More particularly, the disclosed invention relates to an improved container for storage and transportation of goods that comprises a bag-like or box-like container that can be hand-held and that can provide good thermal insulation. The disclosed invention seeks to provide an improved corrugated sheet container and provides a system having first and second cellulose fiber bag-like elements, at least one of which is provided with a surface metallization treatment whereby to provide beneficial thermal characteristics.