Shop-Vac Tear Resistant bags come 2 per package. They can be used for dry pick up and to keep your tank clean. Tear resistant material prevents the bag from tearing durning filling and disposal. These bags are 20% moe efficent than the standard Shop-Vac disposable filter bag. Sturdy plastic collar keeps the bag attached to the inlet and cover seals the opening to keep debris in the bag durning durning disposal.