Plastic bottle including a body (9) extending along a central axis (Z) that includes a lower portion (3) with a substantially constant cross section; followed by a gripping portion (4); and terminated by an upper portion (5) with a substantially constant section and arranged to correspond with the cross section of the lower portion. The gripping portion (4) includes two globally plane gripping panels (41) arranged to be parallel to each other and to the central axis (Z) at a distance convenient for gripping with the hands. These panels have at least one reinforcing relief (44; 45) extending in a transverse plane, and are connected to each other by connecting panels (42) extending along the lower portion (3) and the upper portion (5), through rounded angles located at the circumferential ends of the panels.