Abstract: There is disclosed a process for producing a self-supporting package having an outlet stopper which comprises: (a) a process for supplying a self-supporting bag which has an opening part for filling contents at the top thereof and holding the bag at a vertical position, (b) a process for opening the opening part of the self-supporting bag, (c) a process for filling the self-supporting bag with contents, (d) a process for supplying an outlet stopper which has an outlet with a stopper on a ship-shaped flange to the opening part, and (e) a process for sealing the side faces of the ship-shaped flange of the main part of the outlet stopper to the inner side faces of the opening part of the self-supporting bag. These processes are conducted in the order of the processes (a), (b), (c), (d) to (e), consecutively. An apparatus comprising mechanisms corresponding to the processes (a) to (e) is also disclosed.