Abstract: An improved plastic container including a bottom strengthening formation. The strengthening formation assists in reducing deformation of the bottom of the container when the container is pierced during the beverage brewing process. In a preferred embodiment, the strengthening formation includes a generally gear-shaped path to evenly distribute dynamic forces from a piercing needle or stylus to the spokes or gear teeth of the strengthening formation. The gear-shaped path includes the features of gear design and includes an outer diameter, and inner diameter, and a pitch diameter. In some embodiments, a depression defining and encircling the piercable area further enhances the even distribution of dynamic forces.