Abstract: For a vehicle having a rear storage compartment which has side walls and a floor area, and wherein access is gained to the storage compartment via a rear opening across which is mounted an upwardly opening tailgate for selectable closing and opening of the rear opening, an expandable storage system having an extendible storage member which includes a floor portion for supporting luggage thereon, the floor portion having front and rear edges and side edges extending therebetween, and a pair of parallel side wall portions connected to the side edges of the floor portion so as to extend transversely upward therefrom, thereby to prevent undesired lateral movement of luggage supported thereon; the storage system also having apparatus for mounting the extendible storage member within the storage compartment such that the pair of side walls have a generally parallel orientation to the side walls of the storage compartment, including apparatus for permitting selectable movement of the extendible storage member along