I have stopped using my long life bag in my 33 dust extractor because it has leaked dust since I bought it. My 2 filters had to be cleaned on a daily basis and I had to replace them a couple of times, my dust extractor stopped working and I spent $3oo to fix it. I had it back for 2 weeks and the motor started a high pitched squealing noise so I have gone back to paper bags, now I never touch my filters at all. Not happy about spending nearly $4oo on the long life bag. I work with mdf and solid surface so I guess there is allot of fine dust.