U, U3, and U6. From the air your vacuum pulls through the bag. Filtrete Micro allergen vacuum bags capture 94% of particles larger than 1 micron size including dust mite debris, grass, and ragweed pollen. They also capture 57% of particles between 0.3 and 1 micron in size, including household fibers and other microscopic allergens. Fits models: Panasonic MC-UG300, MC-UG400, MC-UG500, MC-UG700, MC-V5000, MC-V5100, MC-V5200, MC-V5300, MC-V5500, MC-V5700, MC-V6200, MC-V6300, MC-V6600, MC-V6700, MC-V6800, MC-V6900, MC-V7300, MC-V7400, and MC-V7500 series uprights. 3 bags per package. No. 68701A-6: Type: U, U3, U6, Filtration Type: Micro Allergen, For Use With: Panasonic MC-UG300,MC-UG400,MC-UG500,etc, Pkg Qty: 3, Package Type: Hang Tag Thanks for shopping Hipp Hardware Plus's Online Store for all your DIY and Home Improvement needs. Remember Hipps Help!