US Patent 10351305 Package seal having a fibrous breathable material

The invention provides a sterilizable pouch having at least one wall formed of a flexible film and including an opening formed therein for providing communication to an interior space of the package. A breathable material is disposed on an outer surface of the wall covering the opening. The breathable material is joined to the outer surface of the wall with a continuous heat seal. A heat resistant material is positioned between the breathable material an outer surface of the wall.