I got my Brompton and Demano messenger bag from BFold of New York City; nice guys. Been using this combo for a few years now; no issues even with heavy and/or large loads. Do be careful that you have full control of your braking and turning; with whatever front bag you decide to go with. The Demano bag as messenger bag on your back is very functional as well; I don't always use the bag with my bike. Last point I wanted to make - I have worked as a New York City messenger for a few years; use a messenger type bag.