While UNIBAG filters give you the same economical pricing as a similar bag with a sewn construction, Eaton's polypropylene bags offer a fully welded design, ensuring no particles will escape through holes creating during sewing. The polypropylene seal ring provides a chemical resistant closure, and the ringà ¯Ã‚ ¾Ã¢â‚¬â„¢s handle makes replacing the bag a breeze. These bypass-free filter bags are scrupulously tested to meet Eaton's high standards of satisfactoriness. They have a micron rating of 100 and are a size 2. Sold in quantities of 30.