Rigid hinged-lid cigarette packet

A substantially parallelepiped-shaped, rigid hinged-lid cigarette packet comprising a lateral surface (8), and a flat top and bottom end wall (9, 10) facing and parallel to each other and defining said lateral surface (8);

• said lateral surface (8) comprising two facing minor lateral walls (11) and two facing major lateral walls (12);
• and the packet (1) comprising a bottom cup-shaped container (4), and a top lid (6) hinged to the cup-shaped container (4) by a hinge (7) substantially parallel to the minor lateral walls (11);
• at least one of said major or minor lateral walls (12, 11) has an outwardly convex profile and forms respective first obtuse dihedral angles (14) with the two adjacent lateral walls (11, 12);
• wherein said lateral wall (12, 11) having an outwardly convex profile comprises a respective central portion (15) and two lateral bands (16), which are preweakened by longitudinal weakening lines (17) and curving with the concavity facing inwards to connect the relative central portion (15) to the corresponding adjacent lateral walls (11, 12);
• each lateral band (16) forms with the relevant lateral wall (11, 12) a respective sharp edge (13), forms with the relevant lateral wall (11) a first respective obtuse dihedral angle (14), and forms with the relevant central portion (15) a second respective obtuse dihedral angle, which is greater than said first respective obtuse dihedral angle (14).