An airbag module comprising an inflatable airbag; and an inflator configured to provide gas to inflate the airbag; wherein the airbag comprises first and second panels positioned on opposite sides of an inflatable chamber; wherein each of the panels include a peripheral portion and an interior portion; wherein a portion of the interior portion is a covered portion; wherein a portion outside of the covered portion of the interior portions of the first and second panels are connected together to thereby limit the inflation of a portion of the inflatable chamber; and wherein the airbag is configured so that the connection between the interior portions of the first and second panels is released during inflation of the airbag in order to permit an increase in the volume of the inflatable chamber.