A cargo carrier for vehicle tops is comprised of first and second molded clam shells with the clam shells having mated peripheral edges. The secured devices are used for mounting the first clam shell to the vehicle top and a clamp or other fastener is used for securing the clam shells together along the mated peripheral edges to form an enclosed cargo carrying space on the vehicle top. The invention is directed to providing wheels on the second clam shell and a handle system whereby when the second clam shell is removed from peripheral engagement with the first clam shell, the second clam shell serves as a carrier for goods carried in the cargo carrier. The handles for the cargo carrier may be molded in to a trailing edge of the second clam shell. In one embodiment, the handle is a U-shaped member which is slidable to a stowable position and in a second embodiment the U-shaped handle is pivotable around to be stowed in a position on the underside of the second clam shell. The second clam shell is provided with a molded space for receiving a cooler. In a further embodiment, a single wheel is provided and the handles are stowed inside the carrier and inserted into handle receptacles and latched inplace by detent means.