I took the survey ( 20 questions fyi ) after I posted the link and it looks like it's not specifically "messenger bags" she's wanting to design, but a good, functional bag for smaller cyclists. There were questions about panniers and backpacks. I have one of the basil bags that clips onto the back rack (looks more like a purse than a pannier or bike bag) and would definitely use something like it if it had a shoulder strap.
http://www.niagaracycle.com/product_...ducts_id=21077

I'm hoping Fawn will take advantage of these forums and keep us posted on her progress!