Airbag module

An airbag module (30) includes a module cover (35), an airbag (10) configured to inflate in an event of a vehicle emergency, and an inflator (20) configured to provide gas for inflating the airbag (10). The inflator (20) and the airbag (10) are connected to a retainer (40), and the module cover (35) and the retainer (40) are connected to form an enclosure volume (50). A ratio of the enclosure volume (50) to a portion of the enclosure volume (50) that is occupied by components of the airbag module (30) is 100:40 to 100:100. A displacement member (70) is disposed within the enclosure volume (50).