I guess i'm the odd one.. I hate backpacks in comparison to messenger bags, even for the heaviest loads. Groceries and pretty much anything else fits just fine without jabbing your back, but you do have to think about that kinda thing when you're packing it, you can't just toss it in there. I find if I put the heavy stuff towards the lower hanging side that works best. I've never had any problems with it swinging around on its own and I feel perfectly comfortable walking around off the bike with one. Also, backpacks make my pits sweat..
Last edited by bhop; 11-04-10 at 11:58 AM.