I have a 9 gallon Rigid shop vacuum that I use for my stove. I know, I know, metal ash vac... I normally let the stove sit off for 24 to 48 hours before cleaning and when I'm done let the vac sit outside on the driveway for a few hours. Anyway, I use the upgraded filter and these bags: (broken link removed) However, my pre season cleaning I noticed that a trace amount of 'black' made it through, not much, but I had to clean the floor in that area, it wasn't much, but enough to show up on a white sock. Which bags do you guys use? Thanks