Fuente: WIPO "tomato" A packaging blank for forming a package filled with a pourable product includes at least a first transversal crease line and a second transversal crease line extending transversally to a longitudinal axis of the packaging blank and dividing the packaging blank into a top region containing a top crease pattern and a bottom region containing a bottom crease pattern and an intermediate region contained between the first transversal crease line and the second transversal crease line. The first transversal crease line delimits the top crease pattern and the second transversal crease line delimits the bottom crease pattern. The packaging blank further comprises a plurality of linear crease lines parallel to the longitudinal axis and extending from the first transversal crease line and towards the second transversal crease line. Each linear crease line is parallel to the longitudinal axis and extends along only a portion of the intermediate region.