Looks to me like the new iteration of the Nashbar Daytrekker (11L capacity). I used to commute with the previous version, which was even smaller at 7.9L. But perfect if all you have to carry is shirt, socks and underwear, and lunch, and you don't want to haul giant cross-country panniers around everywhere.

Now though I have switched to a kittier, for waterproofness, decoratable surface area, and fredliness.