This is terrible. They are about one-third to one-fourth the thickness of Shop Vac's original yellow filter bags and also have no fleece lining. They are also thinner than cheaper standard vacuum cleaner bags. I tried them on concrete grinding with a cyclone in between which collected most of the dust. The dust that passed through the cyclone went straight through the bag and onto the HEPA filter inside the Shop Vac. Concrete dust, of course, fine dust, but it didn't end up in this bag. It also means that anything, even if it's a little hard, will fly in and easily puncture the bag. I even lengthened the plastic panel that sits right in the opening of the bag to prevent debris from entering the bag once you step inside. (Some types of household canister vacuum bags have a little plastic liner for the "impact zone" like suction for that. If you vacuum feathers, this bag might be for you. Otherwise, no, you're not saving any money buying that bag of crap.
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