Abstract: A self-sealing closure for mailing bags, envelopes, sacks, or similar articles, in which a strip-shaped dry latex, synthetic resin or adhesive gum coating is applied on the inside of a closure flap and on an edge zone of the backside of the mailing bag. A template flap is formed at the free end of the backside, and the magnitude of the contact area between coatings on the closure flap and the backside is variable. The template flap can be folded about a crease line, and in one position of the template flap, there is exposed a partial area of the adhesive contact surfaces, to produce a printed-matter closure. The template flap has another position in which there is exposed the complete area of the adhesive surfaces which may be brought into contact to produce a first-class letter type of seal. The template flap, moreover, has contact cutouts which may have circular, oblong, rectangular, oval or other shapes. The contact cutouts, moreover, are punched out in the vicinity of the front edge of the template flap.