A system includes a bulkhead, a seat spaced from the bulkhead, and an airbag supported by the bulkhead and inflatable towards the seat to an inflated position. The airbag in the inflated position includes a vertex spaced from the bulkhead, a knee-impacting portion tapering from the vertex downwardly and towards the bulkhead, and a head-impacting portion extending upwardly from the vertex. The head-impacting portion includes a head-receiving depression. The head-receiving depression is round.
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