An airbag is provided. The airbag is configured to extend longitudinally along a side of a vehicle and includes a first section configured to inflate in a longitudinal and vertical direction, a second section coupled to the first section and configured to inflate in a longitudinal and vertical direction, an inlet for receiving inflation gas from an inflator, tabs positioned at the top of the airbag for attaching the airbag to a ceiling of the vehicle and chambers positioned between the tabs along the top of the airbag, wherein the chambers stabilize the airbag during deployment.