They are listed as bagged vacuum bags, and the listings indicate "Filter Type: No Filter Needed."
The listings show two different sets of dimensions/weights: 6" (H) x 4" (W) x 8" (D) at 2 lb, and 6" (H) x 1" (W) x 10" (D) at 0.5 lb. These appear as separate entries in the product details.
A 9-pack option is explicitly listed that includes 1 belt.
The listings specify the bags as suitable for "Multi-Surface" use.
Some listings market the bags for allergy and asthma sufferers, citing microfiltration and seller-stated capture rates in the range of roughly 99.7% up to 99.97% for microscopic particles and allergens.