Finally switched after ages with my old Timbuk2 and what a difference! I commute by bike, including going to the market, and live up in the hills. It feels like someone is carrying half of the weight for me. I don't know how they do it. I switched because I was encouraged that the messenger bag was no longer a responsible choice for your neck/spine. No doubt about it, they were right. Feels amazing, really well made and great looking. I am buying the larger one too. Can't go wrong.