a composite container includes a high barrier inner liner member including a metal layer of vacuum - deposited aluminum parallel with and spaced from the longitudinal edge of a synthetic plastic base thereby to define a first web that is helically wound in edge - overlapping relation such that one longitudinal edge of the metal strip overlaps the other longitudinal edge of the metal strip by a given distance . the overlapping edges of the first web are hermetically joined by a heat - sealable bond between an adhesive layer covering the metal strip and the adjacent face of the first web , and a compatible heat - sealable layer on the opposite face of the web . according to the method for forming the container , the first web is formed by longitudinally slitting a supply web having longitudinally extending spaced metal strips on one face thereof along lines of severance spaced from the edges of the metal strips , so that the edges of the metal strip in the helically wound liner layer will be isolated from the container contents . the resultant container provides high storage stability , particularly for contents that are corrosive to aluminum .