A packing method for applying a heat-seal overwrap to a package of tobacco articles; the package comprising: an inner container, which houses a group of tobacco articles and has an open top end; an outer container housing the inner container so as to allow the inner container to slide with respect to the outer container between a closed configuration, in which the inner container is inserted inside the outer container, and an open configuration, in which the inner container is extracted partly from the outer container; and a hinged lid, which closes the open top end of the inner container; the packing method comprising the steps of: folding a sheet of heat-seal wrapping material into a tube about the package to form a tubular wrapping having two open ends at a top wall of the lid and a bottom wall of the package; folding the two ends of the tubular wrapping onto the top wall of the lid and the bottom wall of the package to complete the overwrap; and stabilizing the overwrap by making a first transverse heat seal on the superimposed portions of the sheet of wrapping material on the top wall of the lid, and a second transverse heat seal on the superimposed portions of the sheet of wrapping material on the bottom wall of the package; the packing method being characterized by comprising the further step, at least when making the first transverse heat seal, of compressing a front wall of the outer container, so as to move at least part of a top edge of the front wall of the outer container beneath the top wall of the lid. an inner container, which houses a group of tobacco articles and has an open top end; an outer container housing the inner container so as to allow the inner container to slide with respect to the outer container between a closed configuration, in which the inner container is inserted inside the outer container, and an open configuration, in which the inner container is extracted partly from the outer container; and a hinged lid, which closes the open top end of the inner container; the packing method comprising the steps of: folding a sheet of heat-seal wrapping material into a tube about the package to form a tubular wrapping having two open ends at a top wall of the lid and a bottom wall of the package; folding the two ends of the tubular wrapping onto the top wall of the lid and the bottom wall of the package to complete the overwrap; and stabilizing the overwrap by making a first transverse heat seal on the superimposed portions of the sheet of wrapping material on the top wall of the lid, and a second transverse heat seal on the superimposed portions of the sheet of wrapping material on the bottom wall of the package; the packing method being characterized by comprising the further step, at least when making the first transverse heat seal, of compressing a front wall of the outer container, so as to move at least part of a top edge of the front wall of the outer container beneath the top wall of the lid. folding a sheet of heat-seal wrapping material into a tube about the package to form a tubular wrapping having two open ends at a top wall of the lid and a bottom wall of the package; folding the two ends of the tubular wrapping onto the top wall of the lid and the bottom wall of the package to complete the overwrap; and stabilizing the overwrap by making a first transverse heat seal on the superimposed portions of the sheet of wrapping material on the top wall of the lid, and a second transverse heat seal on the superimposed portions of the sheet of wrapping material on the bottom wall of the package; the packing method being characterized by comprising the further step, at least when making the first transverse heat seal, of compressing a front wall of the outer container, so as to move at least part of a top edge of the front wall of the outer container beneath the top wall of the lid.