Instruct: Classify Amazon reviews into positive or negative sentiment
Query: No filtering information

I gave this product one star because it fails to state (on the web, bag or packaging) the size of the particles that pass through the bag. Electrolux states on their box that it filters out particles larger than 0.3 microns. It is not known how much dust these bags put back in the air, 4 ply does not answer this very important question. If it does not filter out much dust you are wasting your time with these bags.