The invention relates to a bottle of biaxially-oriented thermoplastic material capable of supporting, when it is full, a load exerted in the direction of its longitudinal axis without notable deformation. This bottle, whose body section (2) has a generally square shape, comprises four rounded portions (9) between which are disposed longitudinal ribs (11, 12). Indented transverse ribs (14) are provided over the entire length of the rounded portions (9). IMAGE
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