Our Air storm vacuum bags fit all air-storm vacuum cleaners using the stormy bags. These are an aftermarket replacement. They offer micro-filtration, and high quality manufacturing. Your Air Storm vacuum bag needs to be replaced when it reaches approximately 60-70% capacity. If you wait for it to be completely full then you are not using the full potential of your machine. Save money on costly repairs by replacing your Air Storm bag more often and allowing your vacuum to breath. And remember we offer Free shipping over $50.