A packaging container for dry granular products includes a rectangular container body, and a rectangular cover defining a sleeve surrounding the container body in sliding engagement, both of folded sheet material. The container body having a first pair of opposed width defining sides, a second pair of opposed height defining sides, and a third pair of opposed length defining sides perpendicular to the width and height defined by the first and second pairs of opposed sides. The container body has at least one product discharge opening in second pairs of opposite sides. The cover is slidable over the first and second pairs of opposed sides of the container body between a closed position in which the cover overlies at least one product discharge opening and an open position in which at least one product discharge opening is partially exposed by the cover.