Spare vacuum bag. There is no romance here. The design of this particular bag from Eureka needed improvement from the start. Installing a bag is difficult no matter whose bags you use. These bags make things a bit trickier as an adhesive is applied that attaches the bag to a piece of heavy cardboard that the user has to thread through the grooves (if you know this particular bag you'll understand what I'm talking about here). too close to the edge of the box, leaving very little room for the box to "slide" over the frame of the cleaner. Results? Torn bag. A torn bag must not be used. Very dusty, which absolutely does not allow the use of the bag! You have to be careful, creative and cunning. After installation everything is ready.