paper provided on one surface with a mesh - like pattern , for example a diamond - shaped pattern , or reinforcing extruded plastic material . the extruded plastic material is applied to the paper surface in the form of a plurality of narrow thin stripes or strands adhering to the surface and penetrating through the mass of the paper due to the porosity of the paper and drawing of the plastic material through the paper during application of the plastic stripes or strands by applying vacuum to the opposite surface of the paper . the reinforced paper of the invention is particularly useful for making good - carrying bags commonly used for carrying groceries and other purchased articles from a store .