Long lifespan: lasts up to 50% longer than a regular paper dust bag while maintaining the same suction power. Good filtration: 99% of all dust particles larger than 1 micron are retained. Strong endurance: thanks to synthetic material. Innovative folding: s-bag fits a variety of vacuum cleaners, is easy to insert into the device, and can hold 15% more dust than a simple, flat synthetic bag. Volume per dust bag: 3.5 liters. Contents: 12 dust bags.