My stepdaughter many years ago had one that I drooled over. It was made from buttery soft leather, was just 2 large pieces of leather that slung over her shoulder. It had an outside zipper pocket that hung against her for safety, not on the side away from her body. She used it for traveling a lot, said it was comfortable to wear and could hold a lot of necessities. I think it would be described as being a circle with the bottom half a swollen pouch, with the zipper running up part way on each end of it.
Clear as mud?
I'm thinking I might make myself one of denim to match my jeans. Might be nice to make one to match traveling pant suits.
It would be a very simple pattern.