Collapsible container or carrying case

A collapsible container, comprising:

• a rectangular base plate having a pair of opposite short sides and a pair of opposite long sides;
• a respective generally rectangular side wall hinged to said base plate along each of said long sides and adapted to be folded from erect positions inwardly to overlie said base plate;
• a respective generally rectangular end wall hinged to said base plate along each of said short sides at locations above that at which said side walls are hinged to said base plate and adapted to be folded from erect positions inwardly to overlie said side walls, each of said end walls being provided along opposite edges which are vertical in said erect positions of said end walls with a triangular cross section ridge having a free edge turned inwardly and defined by a first flank parallel to the plane of the respective end wall, a second flank at a right angle to said first flank, and a third flank inclined at an acute angle toward said first and second flanks, each of said side walls being provided along opposite edges which are vertical in said erect positions of said side walls with a triangular cross section ridge having a free edge turned outwardly and defined by a first flank parallel to the plane of the respective side wall, a second flank at a right angle to said first flank, and a third flank inclined at an acute angle toward said first and second flanks, said third flanks of adjoining ridges of each end wall and an adjacent side wall at each vertical edge of said container being in abutting and engaging contact to hold said walls erect;
• and
• a pair of cover plates of rectangular configuration, each of said cover plates being hinged to an upper edge of a respective one of said end walls and being formed along opposite sides of the cover plate perpendicular to the respective upper edge with a downwardly extending lip, each of said side walls being formed along an upper edge thereof with a respective groove, each of said grooves receiving the lips of both said cover plate along the respective side of the container.