Abstract: A box, container, receptacle, cart, and toolbox include a bottom-side panel and four side-panels. A first side-panel includes a first reinforcement tunnel or reinforcement core, hollow or filled, located at or near the top edge or the top rim of the first side-panel. A second side-panel, opposite the first side-panel and generally parallel to the first side-panel, includes a second reinforcement tunnel or reinforcement core, hollow or filled, located at or near the top edge or the top rim of the second side-panel. The two reinforcement tunnels or core contribute to stability and rigidity of the device. An insertable or removable U-shaped handle complements the hollow reinforcement tunnels.

Abstract: The present invention includes a support structure, such as a sawhorse or a workhorse. The support structure includes: a plurality of slanted legs; a set of generally-horizontal bridges, each bridge interconnecting two adjacent legs; and a generally-horizontal roof element interconnecting the slanted legs. At least one of the legs includes an aperture defined therein, the aperture able to receive a beam inserted therethrough. The present invention further includes a support structure made of two such sawhorses, having one or more beams connecting the two sawhorses, and optionally having a board placed on top of the sawhorses to form a worktable.