Hence, the bag can be neatly folded into a boxlike form.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a perspective view of an air bag;FIG. 2 is a plan view of the air bag shown in FIG. 1;FIGS. 3A and 3B are a plan view and a perspective view, respectively, of the air bag shown in FIG. 1, for illustrating the manner in which the bag is folded away;FIG. 4 is a cross section taken on line of IV--IV of