Abstract: A structure which may be shipped as a container has a rectangular floor base portion and two panel assemblies associated therewith. Each panel assembly is made up of a side wall panel pivotally connected to an edge of the base portion by means of a continuous hinge, and another side wall panel fixed thereto and extending inwardly thereof. As a container, these two panel assemblies are positioned with their hinged panels generally perpendicular to the base portion, and with the other panels thereof generally parallel to the base portion. Container end panel members may be fixed to both ends of the structure so that a closed container is defined. Upon removal of the container end panel members, the panel assemblies may be pivoted to expanded, outward positions, and end panels and roof panels, carried in the closed, container-like structure, may be fitted thereto to fabricate and define a building structure.