Plastic container for pressurized fluids

A blow-molded plastic container having a body comprising a neck portion, a generally cylindrical sideway portion and a bottom structure, said bottom structure comprising:

• a central portion;
• a plurality of ribs extending downwardly from said sidewall portion to said central portion, wherein each of said ribs is defined by an upper curvilinear surface and, in cross-section each rib is of a substantially inverted U-shape having a relatively tight radius, said upper rib surfaces lying on a generally hemispherical curvature in the interior of said container;
• and
• a plurality of feet extending below said central portion from said sidewall portion, each foot positioned between two of said plurality of ribs and having a pair of rib-defining endwalls connected to and continuous with the ribs on each side, a curvilinear outer wall connected to and continuous with said sidewall portion, a generally horizontal base surface joined to said outer wall, a generally vertical first inner surface forming a lip extending upwardly from the base surface, and a second inner surface extending from said lip to said central portion.