A portable stowable cargo restraining enclosure assembly for limiting movement of cargo combined with and affixed to a seat cushion. The portable cargo restraining enclosure assembly includes a plurality of sidewalls which are pivoted and/or folded into a collapsed or stowed condition attached to the underside of a seat cushion. During use, the enclosure assembly is pivoted up into and the sidewalls deployed to cooperatively form a walled enclosure for restraint of cargo. The seat cushion is preferably wedge shaped so that when used as a seat cushion, it provides orthopedic advantages. When used as a cargo restraining device, the wedge shape of the cushion helps make the base of the cargo restraining device parallel to the ground plane.