The use of a dust bag reduces the need of servicing the filter. A dust bag also makes using the central vacuum cleaner more hygienic, and its use is recommended especially in homes with pets. 

Allaway microfibre dustbag filters exhaust air efficiently and fills the dust bag optimally - fewer dustbag replacements are needed. The microfibre dust bag doesn't absorb moisture, meaning it won't become a breeding ground for bacteria or mycelia.