VEHICLE OCCUPANT RESTRAINT SYSTEM

A vehicle occupant restraint system comprises a vehicle seat () including a backrest () having a seat back surface (), and an airbag module () integrated in the vehicle seat () including an airbag () which is L-shaped in a horizontal section plane and includes a cushioning portion () positioned along a seat longitudinal direction (L) spaced apart from the seat back surface (), as well as a connecting portion () connecting the cushioning portion () to the vehicle seat (). A fillable head protection chamber () projecting from the cushioning portion () along a seat vertical direction (H) which includes a head cushioning surface () facing the seat back surface () is arranged on the cushioning portion ().