Abstract: A crash restraint apparatus comprising a bag which is inflated to its protective position by an aspirating inflating device, with a two stage compressed gas source to supply aspirating gas to the inflating device. The two stage gas source comprises a high pressure container having a first chamber with a less restricted outlet opening to supply high flow rate aspirating gas during an initial inflation phase, and a second chamber having a more restricted outlet to supply lower flow rate aspirating gas during a later inflation phase. With the passenger in the normal position resting against the back of the car seat, the bag will inflate to its fully inflated position. In the event an occupant is at a forward position adjacent the bag, during the initial inflating phase the bag is inflated to an intermediate position where it inflates around the occupant but does not move him rearwardly to any appreciable extent.