A plastic container (100, 200) comprising: a sidewall (130, 230) configured to receive a label; a finish projecting from an upper end of said sidewall (130, 230), said finish operative to receive a closure; and a base below said sidewall (130, 230), wherein said base has a bottom end that includes: a bearing portion defining a standing surface for the plastic container (100, 200); an up-stand geometry wall of a stacked-ring configuration including a first ring, a second ring, and a third ring, the up-stand geometry wall circumscribed by said bearing portion and extending upward from said bearing portion in a radially inward direction, the first ring defined by a first diameter and a first radius of curvature, the second ring extending from the first ring and defined by a second diameter and a second radius of curvature, and the third ring extending from the second ring and defined by a third diameter and a third radius of curvature, the first diameter being greater than the second and third diameters, and the second diameter being greater than the third diameter; and an inner wall circumscribed by said up-stand geometry wall in end view of the plastic container (100, 200), said inner wall and said up-stand geometry wall being cooperatively operative so as to accommodate pressure variation within the container after the container has been filled with a product and sealed with the closure, said inner wall being operative to flex in response to the pressure variation within the container after the container has been hot-filled and sealed with the closure, whereas said up-stand geometry wall is operative to withstand movement as said inner wall flexes in response to the pressure variation within the container after the container has been hot-filled and sealed with the closure. a sidewall (130, 230) configured to receive a label; a finish projecting from an upper end of said sidewall (130, 230), said finish operative to receive a closure; and a base below said sidewall (130, 230), wherein said base has a bottom end that includes: a bearing portion defining a standing surface for the plastic container (100, 200); an up-stand geometry wall of a stacked-ring configuration including a first ring, a second ring, and a third ring, the up-stand geometry wall circumscribed by said bearing portion and extending upward from said bearing portion in a radially inward direction, the first ring defined by a first diameter and a first radius of curvature, the second ring extending from the first ring and defined by a second diameter and a second radius of curvature, and the third ring extending from the second ring and defined by a third diameter and a third radius of curvature, the first diameter being greater than the second and third diameters, and the second diameter being greater than the third diameter; and an inner wall circumscribed by said up-stand geometry wall in end view of the plastic container (100, 200), said inner wall and said up-stand geometry wall being cooperatively operative so as to accommodate pressure variation within the container after the container has been filled with a product and sealed with the closure, said inner wall being operative to flex in response to the pressure variation within the container after the container has been hot-filled and sealed with the closure, whereas said up-stand geometry wall is operative to withstand movement as said inner wall flexes in response to the pressure variation within the container after the container has been hot-filled and sealed with the closure. a bearing portion defining a standing surface for the plastic container (100, 200); an up-stand geometry wall of a stacked-ring configuration including a first ring, a second ring, and a third ring, the up-stand geometry wall circumscribed by said bearing portion and extending upward from said bearing portion in a radially inward direction, the first ring defined by a first diameter and a first radius of curvature, the second ring extending from the first ring and defined by a second diameter and a second radius of curvature, and the third ring extending from the second ring and defined by a third diameter and a third radius of curvature, the first diameter being greater than the second and third diameters, and the second diameter being greater than the third diameter; and an inner wall circumscribed by said up-stand geometry wall in end view of the plastic container (100, 200), said inner wall and said up-stand geometry wall being cooperatively operative so as to accommodate pressure variation within the container after the container has been filled with a product and sealed with the closure, said inner wall being operative to flex in response to the pressure variation within the container after the container has been hot-filled and sealed with the closure, whereas said up-stand geometry wall is operative to withstand movement as said inner wall flexes in response to the pressure variation within the container after the container has been hot-filled and sealed with the closure.