a variable thickness vehicular airbag is disclosed which includes a primary cushion and a contact cushion . the primary cushion is constructed of a top panel and a bottom panel joined to form a cushion . the contact cushion is joined to one of the panels of the primary cushion . the contact cushion may have an expansion panel and optionally an expansion sleeve . this cushion encompasses an opening in the outer panel and functionally increases the thickness and volume of the primary airbag . this airbag design may be useful in thorax airbags , thorax / pelvic airbags , thorax / head airbags , and inflatable curtain airbags to more effectively absorb the impact of an occupant with a wall of a vehicle during vehicular collisions .