Abstract: A bag, having a top opening and a draw cord arrangement adapted to close the top opening, is provided with a dust ruffle, which is secured inside the bag and extends upward and through the top opening. By this arrangement, the dust ruffle shirrs the top opening when the bag is closed, thereby inhibiting the entry of particulate matter. The dust ruffle is provided with a pair of holes, so that a plurality of bags can be formed into a bag-pack for use on automatic filling equipment by stacking the bags, with the dust ruffle holes aligned, and inserting the rods of a bag-holder into the stack of bags to retain them as a unit. In one embodiment, the bag-holder is inserted from the rear of the stack of bags to form a bag-pack. The bag-pack is then loaded onto an automatic filling machine provided with a pair of hollow, parallel, generally horizontal rails by inserting the rails into the dust ruffle holes and allowing the bag-holder rods to enter the rails.