Vaccum bags with gas medium barrier, made with polyamide coextruded film and a polypropylene sealing layer. The structure is available in two thicknesses “90” and “150” satisfying the specific packaging needs for pasteurized (91°) or sterilized (121°) products, not exceeding four hours treatment. It can be also heated in the microwave up to 900 watt for 8 minutes. Standard and customized sizes are available.