A packaging container includes at least three integrally coupled panels connected by longitudinal scoring lines for forming a bottom and connecting sides of a rectangular case, which can be raised from an individual cardboard sheet; at least one end of the container is countersunk through an end panel arranged retracted inside a reinforced end zone including strips of side and bottom panel material, folded back against the bottom and side panels along a scoring line extending transversely through the bottom and side panels, wherein the end panel, via a transverse lower scoring line, is united to the folded-back strip of the bottom panel, and the end panel, in each side thereof, includes a respective tab connected with the end panel via a scoring line which extends the longitudinal scoring lines through the end zone, and the tab extends beside and parallel to an adjacent side panel of the container.