I have the 2013 version of the Classic Messenger bag--size small--that I'd like to re-purpose as a discreet camera bag. Right now, I've got an OM-D EM-5 with a Panny 20/1.7 on it and a 14-42 kit lens. I plan to purchase an Oly 45/1.8 in the near future, and hope to replace the kit lens with the Oly 12-40 by year's end. I'll also be carrying the mini flash and extra batteries with me. So, I need an insert that would hold the body+a "big" lens, plus the two small primes, plus a minimal amount of additional stuff. I know that Timbuk2 has inserts that should fit, but I wanted to know what other options there are. Thanks!