an installation for manufacturing and filling multiple - cavity bags made from a sheet of plastic material , includes a forming column for forming a multiple - cavity bag , with the column being divided into three zones , a first zone forming a single tubular sleeve by a longitudinal seal of sheet edges thereof , a second zone for forming a bottom and cavities of the bag , and a third zone for filling and closing the bag and moving the closed bag away from the column , and a film feed mechanism for feeding plastic film to the forming column .