UpStart Battery 8 Replacement Kirby Generation 4 Vacuum Bags - Compatible Kirby 204811, Universal Vacuum Bags. Fits Style F, G and Sentria Models. (4-Pack, 2 Bags Per Pack) Replacement Kirby Generation 4 Vacuum Bags; Quantity: 8 (4 Pack - 2 Bags Per Pack) Replaces Kirby 204811, Universal Vacuum Bags Universal style bags fits both F-style and twist-style Kirby Models! Don't let dust and dirt accumulate inside the vacuum then spreading it around your house. Lengthen the life of your vacuum cleaner plus improve the effectiveness and suction of your vacuum by installing a new bag with the same great quality as the name brand but at an affordable price. We recommend replacing your vacuum bags every 30 to 60 days for best performance . Vacuuming with a high-efficiency bag cleans the air inside your house. Ideal for those who suffer from dust-related or allergic discomforts. Removes dirt, dust and allergens while you vacuum to improve the air quality of your home. Made to neutralize odors at the source, releases clean, odor-free air into your home as you vacuum. Breathe easier and feel refreshed by filtering the air inside your household leading to overall better health. Note: Please check your vacuum to make sure you are purchasing the correct parts. On Sale for a Limited Time!