Obviously the 6510A model includes a removable canister that can be both emptied and cleaned, it holds a maximum of 3.6 quarts of dry material such as dust and dirt; the device also includes a convenient bag change indicator to help keep the vacuum peaked at top performance (vacuums pick up considerably less impurities when the bag is full). The Eureka WhirlWind 6510A vacuum includes additional features such as full HEPA filtration support, an on/off brushroll function, a special suction control switch which isolates direct suction power to the area needed most while cleaning (hose, or floor), an easy empty dust cup, and an automatic retractable cord system attached to a convenient button. The WhirlWind 6510A model comes bundled with a floor brush which can be considered an additional accessory.