Premium Material, Superior Performance: Our Air-clean vacuum bags are made of 5 layers of microfiber for better filtration, durability and longer life than other vacuum bags. Wide Compatibility: These replacement vacuum bags are compatible with Miele 3D GN vacuum bags, compatible with Miele Classic C1, Complete C2, Complete C3, S227, S240, S270, S400, S400i - S456i, S600 - S658, S800 - S858, S2 (S20000), S5 (S5000 - S5999), S5 (S8000 - S8999) GN series vacuum bags. The SF-SAC 20/30 filter is superior to part numbers 9917730 and 10408410. Fine Air Filtration: This replacement dust bag for Miele vacuum cleaners features a 5-layer, electrostatically charged Micro Plus filtration system that captures and retains up to 99.97% of dust, pet dander, and more, contributing to a cleaner home and better air quality. It is recommended to replace it every 2 to 3 months. Perfect GN Dust Bag: The dust bag has a built-in lid to prevent dust and debris from re-entering your home. This lid is spring-loaded, which allows it to close immediately upon starting the unit and prevents dust from escaping. The Classic C1 dust bag allows air to circulate easily through the bag, for more efficient vacuuming, even at low power.