I don't have this bag, but I tried it when I was at the store. I actually like this one the best of the basic ones in the line, I think. It did fit over the shoulder, no problem. THe longer strap you can use crossbody too.
Here is a thread that discusses this bag, but I'm not sure if she has modeling photos with just the single strap or not:
I have this and can put the shoulder straps on my shoulder (and I'm not tiny) but I think I'll probably use this more messsenger style - the wider straps are probably not going to stay on my shoulder all that well - they never do (not the bag - just my narrow shoulders