Rigid packet for smoking articles, comprising: - an internal casing containing a group of smoking articles and provided with two smaller walls (24a, 24b) opposite and connected transversely by at least a larger wall (25a, 25b), at least partly surrounding said group of smoking articles, - an external casing comprising a containing body that contains said internal casing and comprises smaller walls (28a, 30a) and larger walls (31a, 32a), and a lid comprising smaller walls (28b, 30b) and larger walls (31b, 32b) and hinged to one of said smaller walls of the containing body and configured to rotate between an open position, in which it allows access to the internal casing, and a closed position in which it impedes access to the internal casing, wherein said lid is hinged to the containing body in correspondence to an upper base that defines, in cooperation with said smaller wall of the containing body, a hinge around which said lid and said containing body can reciprocally rotate, and defining a first hinging axis and wherein said internal casing is provided with at least an articulated holding wall hinged on one side to one smaller lateral wall of the internal casing, and on another side to an internal surface of an upper wall of the lid so as to be mobile solid with the lid in the passage from said open position to said closed position, and vice versa, said articulated holding wall being configured to stably hold the lid, in its maximum open position, so that it is rotated toward the outside by at least 90° with respect to the closed position; wherein said articulated holding wall comprises a first constraining flap connected to an upper edge of said smaller wall by means of a first folding line and a second constraining flap connected to the internal surface of the upper wall of the lid; said first folding line of said articulated holding wall defining a second hinging axis, characterized in that said articulated holding wall comprises a rotation flap connected to said first constraining flap by means of a second folding line and connected to said second constraining flap by means of a third folding line. - an internal casing containing a group of smoking articles and provided with two smaller walls (24a, 24b) opposite and connected transversely by at least a larger wall (25a, 25b), at least partly surrounding said group of smoking articles, - an external casing comprising a containing body that contains said internal casing and comprises smaller walls (28a, 30a) and larger walls (31a, 32a), and a lid comprising smaller walls (28b, 30b) and larger walls (31b, 32b) and hinged to one of said smaller walls of the containing body and configured to rotate between an open position, in which it allows access to the internal casing, and a closed position in which it impedes access to the internal casing, wherein said lid is hinged to the containing body in correspondence to an upper base that defines, in cooperation with said smaller wall of the containing body, a hinge around which said lid and said containing body can reciprocally rotate, and defining a first hinging axis and wherein said internal casing is provided with at least an articulated holding wall hinged on one side to one smaller lateral wall of the internal casing, and