An airbag includes a panel, a secondary panel, and an opening. The panel defines an inflation chamber inflatable to an inflated position and includes a valley in the inflated position. The secondary panel is connected to the panel on opposite sides of the valley and extends across the valley to define a secondary chamber between the secondary panel and the panel. The opening extends through the panel from the inflation chamber to the secondary chamber. During a vehicle impact, the momentum of the occupant may move the occupant towards the secondary panel. The secondary panel may absorb energy from the occupant and reduce or prevent the head of the occupant from rotating.
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