The invention relates to a packaging bag (1) produced continuously from a film (2), for example with a thickness of less than 250 µm, and comprising a front wall (1a) and a rear wall (1b), possibly connected by bellows (1c), a bottom (1d), and a filling opening (1e). According to the invention, the film (2) comprises a water-soluble coating (3) disposed on at least part of its outer or inner surface.