No real specific pack to recommend, but some features to look for;. I don't have a specific cycling pack, just a few multi-purpose ones.
A sternum strap (on the front, between the load straps) is more useful than a waist belt, which ends up under your ribs if you ride leaning forward at all. A sternum strap will draw the load straps together in the front, causing less interference with your arms reaching forward to the bars.
Look for a bag with wide, flat, thinly padded straps; a thick pad is good if you're standing up straight, but if you're leaning forward and reaching forward to the bars, your arms have to push it out of the way.