The Shop-Vac Hippo Filter Bags are engineered to be used specifically with the companys Hippo model of portable industrial vacuum. These filter bags come in packs of 5, with the addition of an easy-to-install secondary filter, and provide the ultimate in dry mess storage. The unique and durable construction of these filter bags makes them a long lasting and effective solution for cleaning up sawdust, drywall debris, and other dry messes from your workshop.