A two-dimensional gas bag blank (10) has a first, a second, and a third side section (12, 14, 16). The first side section (12) is connected to the second side section (14) via a common side edge (18) forming a first edge fold line (18k), and the second side section (14) is connected to the third side section (16) via a common side edge (20) forming a second edge fold line (20k). A surface fold line (12s, 14s, 16s) extends on the surface of each section (12, 14, 16). The surface fold lines (12s, 14s, 16s) form an acute angle with the respective adjacent edge fold lines (18k, 20k).