A method for producing a sealed package for a product may include: providing a sheet packaging material having a crease pattern with a first transverse crease line, a second transverse crease line, and a plurality of further crease lines interposed between the first and second transverse crease lines, the further crease lines extending transversely to the first and second transverse crease lines; obtaining a sealed preliminary packaging unit from the sheet packaging material, the sealed preliminary packaging unit having a preset inner volume and containing the product; exerting a forming action on the sealed preliminary packaging unit so as to fold the sheet packaging material defining the sealed preliminary packaging unit and obtain a package therefrom. During the step of obtaining the sealed preliminary packaging unit, the sheet packaging material may be processed without being folded along the further crease lines.