Abstract: A process for continuously filling a fluid into a plurality of closed bags joined together in the form of an elongated sheet made of two superposed plastics films, the sheet having a baglike flat fluid inlet tube extending longitudinally thereof and formed by heat-sealing the films, the bags being arranged side by side along at least one side of the inlet tube and joined to one another and to the tube, each of the bags being provided inside thereof with a check valve of plastics film adjacent to the tube, the inlet tube being in communication with the bags individually only through a fluid channel of the check valve in each bag.