Abstract: A filing book with bag sheets comprising a cover sheet and a plural number of bag sheets made of plastics and fixed tightly at the central part of the inside of the cover sheet by heat sealing to form a singly bound book has a structure that the central parts of all of a number of bag sheets are tightly fixed with the cover sheet of paper by heat sealing through an intermediate laminate of paper and plastics film, an intermediate plastic bonding tape or a plastic sheet laminated to the cover sheet.The filing book with bag sheets stands upright firmly, gives comfortable feeling to hands by providing stiffness and smoothness to the cover sheet because the cover sheet is made mainly with paper and, at the same time, can be prepared easily by fixing the bag sheets tightly with the cover sheet by heat sealing even though the cover sheet is mainly made of paper.

Abstract: A packaging article using a thermoplastic film or sheet as a raw material therefor. The packaging article is provided with a bag opening in a region thereof. In forming the article, a front bag panel and a back bag panel are thermally fused together along their peripheral edges except the region defining the bag opening, into a bag form. The bag opening is associated with a flap for closing the same which is formed by extending either the front bag panel or the back bag panel and which has a reinforcing body thermally fused thereto. The reinforcing body is in the form of a laminate consisting of paper or synthetic paper having a thermoplastic layer applied thereto by lamination or by extrusion coating, which thermoplastic layer is thermally fused to the flap simultaneously with thermal fusion of the front and back bag panels.