Pac Designs is the best.

Bailey Works, Chicago Wig, Zugster, ReLoad and Chrome also all make excellent bags.

Chrome is the best bang for your buck.

I've done 60 miles with my Pac minimally loaded. It gets heavy, not uncomfortable. I've also done 60 with a ReLoad Civilian, that did get uncomfortable.

I haul my laptop in a Tom Bihn Brain Cell so it's very well protected.

Beyond that, search these forums. There are many, many many threads on mess bags here and in SS/FG.