The method involves producing a continuous strip (1) of flexible bags (2) in rows (lA, lB, 1C, 1D) by the lower and upper films (3, 4) of a synthetic material, by successive stamping and welding operations at regular intervals. A plug is previously fitted to the film (3) for filling and the subsequent placement of a stopper. The strip of flexible bags is packaged in a sealed transport box. Independent claims are also included for the following: (1) a plant for carrying out a method for packaging a liquid or non-liquid, foodstuff or non-foodstuff, sterile or non sterile product in a flexible bag (2) a plug/tap unit for carrying out a method for packaging a liquid or non-liquid, foodstuff or non-foodstuff, sterile or non sterile product in a flexible bag.
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