Abstract: The invention relates to a flexible bag made of a heat-sealable or weldable plastic sheet material and adapted to contain liquid and/or pasty products, the bag comprising two sidewall-forming flat parts sealingly connected to one another along their longitudinal margins and along their lower transverse margin, and forming a dispensing opening adjacent their upper ends.In order to facilitate opening the bag, the invention proposes that two oppositely disposed portions of the sidewalls adjacent the dispensing opening are each provided with at least one outwards projecting bead, the beads of the two sidewalls being disposed opposite one another at congruent positions and terminating at the edge of the dispensing opening.