Bag for business setting?

What is the most business professional bag you offer? I want to use this as a business bag and I commute on my bike. I need something that is hardy but also proffesional-looking enough to not get noticed in the workplace. I'm not sure which size to get, M or L, and the only thing I really want for sure is the grab strap.

Any suggestions? The pro series messenger looks pretty good, but I don't like the bright blue emblem on the shoulder strap.
 
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