I'm a bit late on this thread but thought I'd chime in on the Medium Bailey Works Super Pro bag I just received. I was also looking at the small vs. medium and decided on the medium which is rather large but when I pack it with my change of work cloths, SLR, lunch, phone and iPod and other odds and ends I carry to work it begins to fill up rather quickly; I just don't think the small would have handled these items easily. I wish Bailey had something between 1200 and 1300 cu in, but the 1536 is pretty comfortable also. I haven't commuted with it yet but just walking around with it I can say it's pretty comfortable to carry, far more comfortable than any other bags I currently own. I purchased Chrome metro which I returned because it just wasn't as comfortable to carry off the bike (Chrome makes a great bag though) but the Bailey Works is perfect for both.
I'm thinking that for someone 5'7", ~130 lbs it could be kinda' large though; I'm 5'10, ~190 lbs and at first the medium seemed to be a bit on the large side for me, but I like it now.
Last edited by MulliganAl; 12-08-09 at 03:17 PM.