Bags
I think the best guard against dirt escaping a NON-SEALED vacuum is to use a cloth type hepa type bag because not much of anything escapes them! The Aerus C type bags from perfect are available to fit C type machines, but for whatever reason, there are no other Lux bags that I can find, aftermarket or otherwise that are synthetic cloth (at least the last time I looked) because I looked high and low for them when I had the Renny which takes type R bags. Paper only on those, no cloth type to be found. I think it's ODD!