a retortable pouch is made without the use of metal foil . the improved heat sealable structure has an inner heat seal layer of linear low density polyethylene . the second , or adjacent layer is a blend of 20 % to 80 % linear low density polyethylene and 80 % to 20 % propylene ethylene copolymer . optional third , fourth and fifth layers are propylene ethylene copolymer . a sixth layer is anhydride modified polypropylene . a seventh layer is nylon , the eighth layer is ethylene vinyl alcohol copolymer and the ninth layer is nylon . the entire multiple layer structure is firmly adhered together so that the layers mutually support each other in the unitary package .