a non - foil mono - web liner for adhering to an inner surface of a paperboard body of a composite container , the liner comprising a polymer film web having an inner surface for facing an interior of the container and an outer surface for facing the paperboard body , a vapor - deposited coating of barrier material covering the outer surface of the polymer film web , a protective coating of polymer material covering the vapor - deposited coating of barrier material , and an inner heat seal layer covering the inner surface of the polymer film web and forming an innermost surface of the liner . the liner thus is structured and arranged so that when wrapped into a tubular shape with opposite edges of the liner overlapping each other , the edges are heat - sealable together via the inner heat seal layer .