Courier Bag Is Numbing Me

djm778 Hey all,
Recently I have been getting numbness in the top of my forearm, I think this is from the pressure exerted from my crumpler bag when riding. The only thing I can think of doing is going back to using a rucksack...boohoo...anyone else suffer this problem...any cures(apart from not riding as much). Are rucksacks really sad? Any recommended bags (courier or sack...not scrotum)?

do you have the crumpler strap pulled so the top of the bag is up by your shoulder blades? that's where my pac is when i'm riding, although it's pretty big so it kind of covers my whole back.

just get what's comfy. i find backpacks very painful after more than 5 min, whereas with my pac i don't even notice it's there.