I've seen many people knock out spare bags for one reason or another. Poor fit, poor filtration etc. They work well - they fit well and appear to be well made. I can't swear it filters better than any other bag, and I know third-party bags can be a bit smaller, but that's not a huge amount of money - and for all my vacuums (a dog plus a cat = daily vacuuming) I would like to think that the bag does not throw out a lot of dust - I would buy it again.
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