Messenger bag for NEX-6 and 3 lenses?

I'm looking for a smallish messenger bag for a NEX-6, Sigma 19 & 30 and Sony 50, along with a couple of spare batteries and memory card.  Right now I'm using a Sony LCS-EMF/B case which actually fits everything, but the zipper closure is a little inconvenient (have to zip it closed every time so one of the lenses doesn't fall out).

My preferences:

-The more the bag looks like a regular bag and less like a camera bag, the better.

-Smaller bag is better (just large enough to hold all of the above)

-I would also like to keep it under $70 if possible

Thanks for any suggestions.