A roof rack system for a vehicle includes a first longitudinal bar and a second longitudinal bar disposed on opposite longitudinal sides of the vehicle. The first longitudinal bar defines a first guide channel, and the second longitudinal bar defines a second guide channel. The first guide channel and the second guide channel guide a transverse bar between a stowed position, wherein the transverse bar is flush with an exterior surface of the roof, and a deployed position, wherein the transverse bar is vertically spaced from the exterior surface of the roof.