Abstract: The present invention relates to a method of manufacturing bag-like packages of flexible material, in which each package is so arranged as to have a number of closure ribbons (38, 48). A blank belt (1) which is essentially double-folded in its longitudinal direction is divided into a number of consecutive, bag-like packaging blanks (7). A number of closure ribbons (38a, b and 48a, b) extend through similarly located channels in all the packaging blanks. The ribbons are shortened in their longitudinal direction, for instance by folding. The blank belt is moved over guide devices (6a, b) which open the packaging blanks at the same time as the distance between their openings (32", 32"') increases. This causes drawing out of sections of the closure ribbons (38, 48) from the channels in the adjacent packaging blanks. The drawn-out closure ribbons are attached to each other in pairs and are cut off at the areas of attachment so as to form endless closure ribbons for each and every one of the packaging blanks.