plastic bottle including a body extending along a central axis that includes a lower portion with a substantially constant cross section ; followed by a gripping portion ; and terminated by an upper portion with a substantially constant section and arranged to correspond with the cross section of the lower portion . the gripping portion includes two globally plane gripping panels arranged to be parallel to each other and to the central axis at a distance convenient for gripping with the hands . these panels have at least one reinforcing relief extending in a transverse plane , and are connected to each other by connecting panels extending along the lower portion and the upper portion , through rounded angles located at the circumferential ends of the panels .