A container is realisable by folding a laminar element (10), and the laminar element comprises: mutually adjacent principal faces (20), connected to each other by principal folding lines (30), the principal faces extending along a principal axis (20a) and presenting respectively principal sides (20b) parallel to the principal axis and located respectively at a first (20c) and a second distance (20d) from the latter; auxiliary faces (40) emerging from each principal face along respective second axes of extension (40a) orthogonal to the principal axis and connected to the principal faces by auxiliary folding lines (50). For at least one pair of principal sides of at least one principal face, the first and the second distance are different in value, the principal sides of a principal face presenting a respective offset (60), transverse with respect to the principal axis and different, for each principal side, with respect to an ideal mid-line of the principal face to which they belong.