A rigid centrifuge container for separating components of a fluid, comprising a rigid annular body having an axial core and an interior collection chamber for receiving and holding the fluid during centrifugation. The chamber has a generally off-centered figure eight-shaped side cross-sectional configuration, wherein the narrowest portion of the chamber is closer to the inner perimeter. The chamber further has an inlet channel extending radially from the core to a distance near the outer perimeter of the chamber, and an outlet channel extending radially from the core to a distance approximately near the narrowest portion of the chamber. The distal end of the inlet channel is in fluid communication with the interior of the chamber, and the distal end of the outlet channel is in fluid communication with the interior of the chamber at the narrowest portion.