a heat sealing layer is provided for multiply tubular film preferably of the type having an inner shrink layer of an irradiatively cross - linked ethylene vinyl acetate copolymer , a core barrier layer of vinylidene chloride - vinyl chloride copolymer , and an outer abuse layer of an ethylene vinyl acetate copolymer , the sealing layer being melt bonded onto the shrink layer and being composed of a propylene ethylene random copolymer . heat seals formed in making bags from the improved film demonstrate enhanced high temperature strength and grease resistance . an associated method for making the tubular film is also provided .