A reinforced package, comprising: four sides (L1, L2, L3, L4) each of which comprises a blank having: a median flap, which defines a lateral side of the package; a first side flap, which defines an upper surface of the package, joined to the median flap at a first folding line; a second side flap, which defines a lower surface of the package, joined to the median flap at a second folding line, which is parallel to the first folding line; at least a first reinforcement flap, which is joined to one end of the median flap at a third folding line which is perpendicular to the first and second folding line (23,24); a second reinforcement flap joined to a second end of the median flap at a fourth folding line which is parallel to the third folding line; wherein the package comprises two opposite sides (L3,L4) in which: the first reinforcement flap is provided with two lateral appendages (51,52), which are joined to the reinforcement flap at respective lateral folding lines (51a, 52a) aligned to the first and second folding line (23,24); the second reinforcement flap is provided with two lateral appendages (61,62), which are joined to the reinforcement flap at respective lateral folding lines (61a, 62a) which are aligned to the first and second folding line (23,24); wherein: each first reinforcement flap is superposed on the lateral portion of an adjacent side and the lateral appendages (51,52) are superimposed respectively to the first side flap and to the second side flap of the side thereof; each second reinforcement flap is superposed on the lateral portion of an adjacent side and the lateral appendages (61,62) are superimposed respectively to the first side flap and to the second side flap of the side thereof. a median flap, which defines a lateral side of the package; a first side flap, which defines an upper surface of the package, joined to the median flap at a first folding line; a second side flap, which defines a lower surface of the package, joined to the median flap at a second folding line, which is parallel to the first folding line; at least a first reinforcement flap, which is joined to one end of the median flap at a third folding line which is perpendicular to the first and second folding line (23,24); a second reinforcement flap joined to a second end of the median flap at a fourth folding line which is parallel to the third folding line; wherein the package comprises two opposite sides (L3,L4) in which: the first reinforcement flap is provided with two lateral appendages (51,52), which are joined to the reinforcement flap at respective lateral folding lines (51a, 52a) aligned to the first and second folding line (23,24); the second reinforcement flap is provided with two lateral appendages (61,62), which are joined to the reinforcement flap at respective lateral folding lines (61a, 62a) which are aligned to the first and second folding line (23,24); wherein: each first reinforcement flap is superposed on the lateral portion of an adjacent side and the lateral appendages (51,52) are superimposed respectively to the first side flap and to the second side flap of the side thereof; each second reinforcement flap is superposed on the lateral portion of an adjacent side and the lateral appendages (61,62) are superimposed respectively to the first side flap and to the second side flap of the side thereof. the first reinforcement flap is provided with two lateral appendages (51,52), which are joined to the reinforcement flap at respective lateral folding lines (51a, 52a) aligned to the first and second folding line (23,24); the second reinforcement flap is provided with two lateral appendages (61,62), which are joined to the reinforcement flap at respective lateral folding lines (61a, 62a) which are aligned to the first and second folding line (23,24); wherein: each first reinforcement flap is superposed on the lateral portion of an adjacent side and the lateral appendages (51,52) are superimposed respectively to the first side flap and to the second side flap of the side thereof; each second reinforcement flap is superposed on the lateral portion of an adjacent side and the lateral appendages (61,62) are superimposed respectively to the first side flap and to the second side flap of the side thereof. each first reinforcement flap is superposed on the lateral portion of an adjacent side and the lateral appendages (51,52) are superimposed respectively to the first side flap and to the second side flap of the side thereof; each second reinforcement flap is superposed on the lateral portion of an adjacent side and the lateral appendages (61,62) are superimposed respectively to the first side flap and to the second side flap of the side thereof.