A method for making a package of groups of products for sanitary use, the method comprising at least the following steps: - forming a length of tubular film by means of continuous film around a frame comprising elements for folding the film and a plurality of walls (6, 7) forming a tubular channel for the passage of the groups of products; the tubular channel having at least a width and a height; - a first join, wherein head flaps of the film are joined to form a head end, using first transversal joining elements positioned close to the front end of the frame relative to a feed direction of the groups of products; - inserting in the tubular channel, in the feed direction and using a pushing unit, a predefined number of groups of products, advancing until close to the closed head end of the film to form a first portion of the package; - further feeding of the groups of products beyond the first joining elements, with simultaneous feeding of the film and relative forming of a further portion of the package beyond the frame; - a second join, wherein the longitudinal superposed flaps of the film are joined by second longitudinal joining elements, simultaneously with the further feeding step; - a third join, wherein the tail flaps of the film are joined, using the first transversal joining elements, in order to close the package at the rear of the groups of products bagged; characterised in that it comprises, at least between the step of introducing the groups of products in the tubular channel and the step of further feeding the groups of products beyond the first transversal joining elements, a step of modifying the size of the tubular channel using a movement device for moving the frame in such a way as to reduce a cross section of the tubular channel and obtain a reduction in the overall size of the groups of products by flattening them. - forming a length of tubular film by means of continuous film around a frame comprising elements for folding the film and a plurality of walls (6, 7) forming a tubular channel for the passage of the groups of products; the tubular channel having at least a width and a height; - a first join, wherein head flaps of the film are joined to form a head end, using first transversal joining elements positioned close to the front end of the frame relative to a feed direction of the groups of products; - inserting in the tubular channel, in the feed direction and using a pushing unit, a predefined number of groups of products, advancing until close to the closed head end of the film to form a first portion of the package; - further feeding of the groups of products beyond the first joining elements, with simultaneous feeding of the film and relative forming of a further portion of the package beyond the frame; - a second join, wherein the longitudinal superposed flaps of the film are joined by second longitudinal joining elements, simultaneously with the further feeding step; - a third join, wherein the tail flaps of the film are joined, using the first transversal joining elements, in order to close the package at the rear of the groups of products bagged; characterised in that it comprises, at least between the step of introducing the groups of products in the tubular channel and the step of further feeding the groups of products beyond the first transversal joining elements, a step of modifying the size of the tubular channel using a movement device for moving the frame in such a way as to reduce a cross section of the tubular channel and obtain a reduction in the overall size of the groups of products by flattening them.