Here's a nice messenger bag with a rather classy classic style design. It has large gray checkers in a strip, that's not too busy. The classic logo is either gray or silver-tone ink & nice/big. Classic running Sonic stock art adds a splash of color to the otherwise black/gray bag. It has a shoulder strap (Seen bound, to the side) and 2 buckles to keep the top flap shut. These look like they use real metal and may be adjustable. The bag is a thicker sort of canvas type material. This looks like a quality bag. 

TODO: Add some size comparison photos (this is not a very large bag, a laptop won't fit in)