Unfortunately, after the bottle, there's not much room on the frame for anything else. It seems most of today's crop of MB frames have a dissected seat-post and extra bracing in the center to make up for it. I was lucky enough to find one on which that is not so and enough room for a bottle.
Mono-shock in front of the seat-post, cables under the top post.
I'm also gonna have problems with proper panniers, which mount to the axle. That's not practical, as the axle moves up & down. I currently have a seat-post mounted rack and a pretty large bag. I wouldn't think of hanging anything off the sides.