Abstract: A portable storage assembly for use in the cargo space of a truck comprising foldable sets of shelf panels, each set including at least two shelf panels hingedly connected to one another and to an interior side wall of the truck so as to be movable between a folded, stored position and an extended, operable position. The shelf sets are hingedly mounted along opposite interior walls at various levels spaced from the truck floor so as to form storage shelves extending transversely across the width of the truck at various height levels in the cargo space when in the extended, operable position. A pair of transverse support bars extending between the opposite interior walls, and secured at opposite ends by U-shaped braces, provide support to an under side of the shelf panels so that a load can be placed on an upper support surface of the panels.