A smoking article pack blank having a lid (2) and a base portion (3), the lid and the base portion being interconnected along a hinge line (27) and the base portion comprising first (24) and second (25) main panels. The main panels of the smoking article pack blank each having side panels (32, 33, 38, 39) depending therefrom and at least one of the side panels having a side flap (35) depending therefrom. When erected the smoking article pack blank may be hinged about a longitudinal axis (34) of a side wall thereof. The invention further provides a smoking article pack assembly, which pack assembly comprises the smoking article pack blank and a plurality of inner blanks. The smoking article pack assembly may be hinged into an open position thereof about a longitudinal hinge line in a side wall of the erected pack assembly.