Abstract: A self-contained dunnage system includes a box sized to receive a supply of sheet stock material with minimal or no empty space when the box is closed. The box has one or more flaps that are movable between a generally planar closed position where the flaps cooperate to close the box and an inclined operating position displaced from the closed position. In the operating position, the ends of the flaps define a dispensing outlet spaced from an open side of the box defined by the side wall or walls of the box. The dispensing outlet is smaller than the open side of the box such that as the sheet material is pulled from the box and through the outlet, the inclined flaps act as a forming member that inwardly gathers the sheet material, causing it to crumple as it is withdrawn from the box.