Deuter race x is a 10l sack with air stream back ( a little better for sweaty back) and a rain cover that is bright orange. Its a great commuter bag.
If you need to carry more, I also have the 28l version that they don't seem to do anymore. Has a frame back that is super cool, the nearest I can see in their range now is the transalpine.
Generally though, my big deuter is nearly 10 years old and looks totally brand new, has been all over the place, chucked about, washed, filthy mud, rain , salt...very well built.
As a general comment though, I cant keep shirts uncreased in a ruck sack...despite all manner of folding, rolling, placing in tubes etc. The inly bag I have that allows me to wear a shirt that I carry is my crumpler dinky messenger bag. But that isn't what I would call waterproof