Felt
By definition, felt is a "non-woven" CLOTH. Cloth is produced by weaving, knitting, crocheting, knotting, or pressing (e. g. felt) natural and/or artificial fibers together. My Kirby 4C bag has a felt bag. As far as I know, it is the only Kirby ever produced with that type of bag. I think most people would agree that it has a CLOTH bag, even though it wasn't made on a loom. Therefore, it's clear that not all CLOTH is produced on a loom by weaving fibers together. For that reason, polypropylene bags are CLOTH.
