I''ve inherited a new Delta DC model 50-775 from my brother-in-laws estate. It's like new. The two bags are the source of my curosity. Both upper and lower bags appear to be made of a heavy felt material and are only about 24" long. I'm acustomed to seeing DC bags that are round and as long as teh stand is tall - so what am I looking at? There are no logo's on the bags.