packaging material configured to be folded and sealed to produce a gable - top package for pourable food products comprises a web of material provided with a crease pattern along which the web of material is foldable . the crease pattern includes first and second transverse fold lines extending transversely across the material web , and a plurality of longitudinal fold lines extending longitudinally away from the first transverse fold line toward the opposite longitudinal end of the web of material , with adjacent pairs of the longitudinal fold lines defining respective walls of the gable - top package when the packaging material is folded and sealed . the crease pattern also includes a pair of oblique fold lines extending obliquely from the first transverse fold line to the second transverse fold line such that an area enclosing triangular panels is bounded by the oblique lines and portions of the first and second transverse fold lines .