How hygienic is it without a bag?

Hygienic emptying. Unlike other bagless systems, coarse dust is separated from fine dust. The fine dust is then collected in a separate container with the help of the Gore® CleanStream® fine dust filter. This keeps the fine dust contained when emptying the appliance.
Gore® CleanStream® fine dust filter
The innovative principle of separating coarse debris into a transparent dust container and fine dust into a different container with a separate fine filter makes emptying the Blizzard particularly hygienic. When compared to other bagless systems, the Miele Blizzard excels with significantly less fine dust escaping during emptying.
The dust container can be easily removed from the appliance by lifting it out by its handle. With one click on the "empty" button, the container opens and all the dust drops into the bin.
Special sensors monitor the Gore® CleanStream® fine-dust filter. The ComfortClean function automatically cleans the fine dust filter as required. After only a few seconds, the Blizzard CX1 is ready for use again and keeps on vacuuming powerfully.
Exhaust filter
The exhaust filter in the Miele Blizzard CX1 saves time and costs. It is absolutely maintenance-free and of such high quality that it lasts for the entire life of the appliance. It never needs to be changed or cleaned.
Hygiene Lifetime Filter
The Hygiene Lifetime filter features very high dust retention capacity and collects 99.98 % of all fine particles*. This is the level of hygienic cleanliness you should expect to have in the home.
HEPA*Lifetime filter
Thanks to the HEPA* 13 Lifetime filter, the system retains even the smallest of particles such as fine dust and allergens to 99.999 %*. This excellent filtration performance has been endorsed by the medical organization Allergy UK and has been certified as being suitable for allergy sufferers. The Miele Blizzard CX1 has been awarded the “Seal of Approval” for its overall performance in dust retention.
According to EN 60312-1According to EN 1822/2011 Features depend on model