Yuo...sorry for the abreviation, habbit. ;) Thanks for the observations about the strap. That really is my primary consideration. Worn over my shoulder opposite the bag should distribute the weight well enough that weight is not an issue.
Quick question: RA=Rheumatoid arthritis? And maybe Darcy can tell us about the Super Ego strap? (I think it's still the old style one, and you might be better off with an Absolute Strap or maybe the new strap option Tom is developing for messenger bags. But I think only the ID bag has been redesigned so far to enable use of the Absolute Strap, and the Super Ego still uses the older strap)