Abstract: A carton formed of a single blank of cardboard or the like cut and scored to form four wall panels and an attachment flap, each wall panel having foldably attached thereto a flap comprising a plurality of rectangular foldable flap sections. The flaps attached to an opposing pair of wall panels are foldable to form a pair of spaced flap assemblies constituting beams for supporting projecting members of filing binders stored in the carton. Hand openings are formed in that pair of wall panels immediately under the beams. The flaps attached to the other pair of opposed wall panels are foldable so that notches formed therein create shoulders for underlying end portions of the beams.