I order the Hoover brand type y replacement bag for my Hoover vacuum cleaner . they cost a little more than some generic type y bag , but I think it be worth it to buy the manufacturer 's bag to ensure a proper fit . the bag opening attach to the vacuum cleaner port and the bag have to have a immediate 90 degree bend to fit inside the enclosure . a previous bag not make by Hoover seem to fit poorly and some debris would collect inside the vacuum cleaner without reach the bag . since I have these Hoover bag , I have not experience that problem , so it seem to be worth a few cent more . shipment be very prompt .