The present invention provides an airbag module (1) in particular for a front passenger (21, 23) of a vehicle, comprising an inflatable bag (3) having at least a first outer panel (33) and a second outer panel (35) arranged substantially symmetrically to each other with regard to a vertical middle plane (M) of the inflated bag. The airbag is characterised in that the inflatable bag (3) comprises a strap structure (5) substantially located between the first and second outer panels (33, 35), wherein the strap structure (5) is designed such that the bag is extendable from a first state having a first size to a second state having a second size depending on the size of the respective passenger and/or the kind of impact.