Regina / Royal vacuum cleaner style T Royal-Aire filtration bag fits Regina model HDU600 and Royal vacuum models RY5300 and RY5400. Traps 99.9 percent of all particles as small as 5 microns. Retains dust, pollen, bacteria and other contaminants while you vacuum. Ideal for allergy sufferers. These are genuine unused Royal T bags sold individually. No packaging. We get a discount from Royal vacuum by buying them in bulk. This is for 1 genuine bag.