Abstract: An article of luggage which includes a luggage case having a peripheral side wall which is made of a flexible material. In order to impart some degree of rigidity to this flexible side wall, a frame structure is situated in the interior of the luggage case and extends along the inner surface of the side wall thereof. This frame structure has at each of a plurality of regions thereof a pair of frame portions which are substantially rigid and which terminate in free ends which are spaced from and directed toward each other. This frame structure also includes at each of the above regions thereof a spring construction which is operatively connected with the frame portions for acting on the latter to urge them apart from each other so as to tend to increase the distance between the free ends thereof. Thus, the substantially rigid frame portions are pressed by the spring means against the inner surface of the side wall of the luggage casing to impart a certain degree of rigidity to the side wall.