a bag , for e . g . collecting garbage or freezing foods , includes a thin , flexible material , e . g . plastic foil formed with an opening , which in its flat - laid state is bounded by two facing edges . a flexible stiffener made of plastic or a similar material is attached along each of these edges . the two stiffeners are connected with a foil hinge at their ends . the bag is furthermore provided with means to bend the stiffeners in a direction opposite to each other . a single operator , without the risk of soiling his or her fingers , can quickly and easily fill the bag .