This topic was raised in another thread recently. (see link below) Apparently, Miele changed their bag design and at least for some models there is no longer a flexible laytex gasket on the mouth of the bag, and the consequent lack of a tight seal allows dust to enter the bag chamber. I had an S314 for years (left it with my ex 3 years ago) and never had the slightest bit of dust escaping the cloth-like bags. They were so effective they made the HEPA exhaust filter almost superfluous.
[URL unfurl="true"]http://www.vacuumland.org/cgi-bin/TD/TD-VIEWTHREAD.cgi?14555_11[/URL]
