Abstract: A multi-layer seal material comprising a layer of paper or pulp, next to a layer of polymer, next to a layer of metal foil, next to a layer of adhesive polymer, the seal containing micro-holes allowing the seal to be breathable. A method of making a sealed container is also described by forming the multi-layer seal material described above, using laser drilling to generate the micro-holes in the seal material, placing the adhesive polymer layer of the multi-layer seal material onto a container filled with product material, heating the seal material to bond the seal to the container, thereby forming a product filled container having a breathable seal.