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1. A vehicle occupant restraint system comprising a vehicle seat including a backrest with a seat back surface, wherein the seat back surface is provided for a vehicle occupant seated in the vehicle seat to lean against the same, and comprising an airbag module integrated in the backrest which comprises an airbag that is L-shaped in a horizontal section plane and includes a cushioning portion forming a first leg of the Land being positioned along a seat longitudinal direction spaced apart from the seat back surface, as well as a connecting portion forming a second leg of the L and connecting the cushioning portion to the backrest, wherein a fillable head protection chamber projecting from the cushioning portion along a seat vertical direction which includes a head cushioning surface facing the seat back surface is arranged on the cushioning portion, wherein the cushioning portion extends vertically upward from the connecting portion and has a lower side comprising a bearing surface, wherein the connecting portion is configured to extend along and above thighs of the vehicle occupant, and the cushioning portion is configured to extend laterally across the thighs of the vehicle occupant so that the bearing surface is positioned against the thighs of the vehicle occupant seated in the vehicle seat so that the thighs in combination with the backrest act as a reaction surface that supports the cushioning portion against the vehicle occupant moving forward into engagement with the cushioning portion.
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