Abstract: A modular storage apparatus having a base member comprised of an outer shell and an interior support frame. The outer shell has a bottom surface configured to attach to the tie down bolts of a rear seating support of a typical Sports Utility Vehicle. A top surface may be reversibly inset within lateral support walls to serve as a base for cargo contained in various attachments. One or more compartments contained within the outer shell may be actuated between an open and closed position by sliding each compartment along an opposing pair of interior support frame members. The outer shell, in combination with moveable magnets and threaded engagement means, provides support for various cargo containing attachment members.