The sleeping bag is an old Army mountain bag. It is big and it is heavy and it takes up a lot of space, compressed or not, it requires its own pannier. I also have a pillow that I made in that pannier with it.
I use waterproof stuff sacks now because of the compression I can get with them. Sea to Summit is my go to. By forcing the air out of the bag, it is essentially doing what a compression bag does.
The Jandd mountain bags have a large top pocket that can be removed from the main bag, although I don't see why there is any need to ever remove it outside of over-stuffing the bag itself. That is where the tools, lube, tube go. Each bag has a side pocket as well. One is mesh and the other is not. Really well thought out design, and I think they were likely intended for someone doing an around the world tour.
Being a tinkerer, I couldn't leave a very good retention system design alone, and modified it to mimic what the Jandd Economy Pannier uses. Works the way I want it to work, plus had lots of fun fabricating aluminum hardware for it.