A sealed package (1, 1', 1", 1′′′) containing a pourable food product and comprising a bottom portion, a top portion and a main portion interposed between said bottom portion and said top portion and including a plurality of side wall portions; wherein said main portion is divided from said bottom portion and said top portion respectively by a bottom peripheral outline and a top peripheral outline (9, 9''), each having an endless configuration and extending transversally with respect to a longitudinal direction, along which the total height of the package (1, 1', 1", 1′′′) is defined; wherein each of said bottom peripheral outline and said top peripheral outline (9, 9") has a broken-line shape and is formed by a plurality of contour edges (8a, 8b, 8c; 9a, 9b, 9c; 9a", 9b", 9c") joined to each other; wherein said bottom portion comprises a quadrilateral bottom panel delimited by said bottom peripheral outline, in turn formed by a bottom front edge, a bottom rear edge parallel to said bottom front edge and two bottom side edges of said package (1, 1', 1", 1′′′) orthogonal to said bottom front edge and said bottom rear edge, said quadrilateral bottom panel extending orthogonal to said longitudinal direction; and wherein said top portion comprises a quadrilateral top panel (14, 14'') delimited by said top peripheral outline (9, 9"), in turn formed by a top front edge (9a, 9a'') parallel to said bottom front edge and said bottom rear edge, a top rear edge (9b, 9b") parallel to said top front edge (9a, 9a") and two top side edges (9c, 9c") of said package (1, 1', 1", 1′′′) orthogonal to said top front edge (9a, 9a") and said top rear edge (9b, 9b"), said quadrilateral top panel (14, 14") extending transversally to said longitudinal direction; characterized in that the area of the bottom panel is different from the area of a top quadrilateral obtained by projecting, along said longitudinal direction, said top panel (14, 14'') on a reference plane parallel to said bottom panel, crossing the package (1, 1', 1", 1′′′) and containing at least one (9a, 9a") of the contour edges (9a, 9b, 9c; 9a", 9b'', 9c'') of said top peripheral outline (9, 9''). wherein said main portion is divided from said bottom portion and said top portion respectively by a bottom peripheral outline and a top peripheral outline (9, 9''), each having an endless configuration and extending transversally with respect to a longitudinal direction, along which the total height of the package (1, 1', 1", 1′′′) is defined; wherein each of said bottom peripheral outline and said top peripheral outline (9, 9") has a broken-line shape and is formed by a plurality of contour edges (8a, 8b, 8c; 9a, 9b, 9c; 9a", 9b", 9c") joined to each other; wherein said bottom portion comprises a quadrilateral bottom panel delimited by said bottom peripheral outline, in turn formed by a bottom front edge, a bottom rear edge parallel to said bottom front edge and two bottom side edges of said package (1, 1', 1", 1′′′) orthogonal to said bottom front edge and said bottom rear edge, said quadrilateral bottom panel extending orthogonal to said longitudinal direction; and wherein said top portion comprises a quadrilateral top panel (14, 14'') delimited by said top peripheral outline (9, 9"), in turn formed by a top front edge (9a, 9a'') parallel to said bottom front edge and said bottom rear edge, a top rear edge (9b, 9b") parallel to said top front edge (9a, 9a") and two top side edges (9c, 9c") of said package (1, 1', 1", 1′′′) orthogonal to said top front edge (9a, 9a") and said top rear edge (9b, 9b"), said quadrilateral top panel (14, 14") extending transversally to said longitudinal direction; characterized in that the area of the bottom panel is different from the area of a top quadrilateral obtained by projecting, along said longitudinal direction, said top panel (14, 14'') on a reference plane parallel to said bottom panel, crossing the package (1, 1', 1", 1′′′) and containing at least one (9a, 9a") of the contour edges (9a, 9b, 9c; 9a", 9b'', 9c'') of said top peripheral outline (9, 9'').