Upright vacuum cleaner with cyclonic airflow

An upright vacuum cleaner (A) includes an upright housing section (B) and a nozzle section (C). A cyclonic airflow dirt and dust separating chamber (54) is defined in said upright housing section. A suction source (E) pulls air and entrained dirt, dust, and other contaminants through a main suction opening (26) formed in the underside (24) of the nozzle and into the cyclonic airflow chamber (54). The cyclonic airflow chamber causes the suction aistream to travel in a cyclonic path such that the entrained contaminants are separated therefrom and deposited into a dirt container (52). A main filter assembly (50) includes a main filter element (H) for filtering residual contaminants from the suction airstream between the chamber and the suction source. The main filter element (H) includes a convoluted outer surface (112).