This review is of the product and not of the purchase or seller. I have ordered these bags 3 times and all 3 times I have received the EnviroCare bags that I was expecting. They are made of thick and durable cloth-like material that is excellent at trapping dust. I'm not sure they capture 99.9% of all dust as the vacuum chamber is dust tight (although that's maybe 0.1% for a month's use?!). Having used at least 9 of these now I've never had a problem with them, they don't tear and work exactly as I expected while costing a lot less than other brands.