Need to replace your Kirby vacuum bags? No problem! The Kirby Allergen Reduction Filter Bag is the most popular of all our Kirby bags. Every single one of our Kirby bags reduces common household dust, pollen and other particles. The electrostatically charged material traps particle matter after it is picked up from your floor. This keeps dirt and dust inside your Kirby vacuum bag and not in the air around your home. Universal Style fits both F-Style and Twist-Style Kirby Models. Works with G4, G5, Gsix, Ultimate G, Ultimate G Diamond, Sentria, Sentria II, and Avalir models.