Even in cool weather, I get really sweaty, so maybe you could get a rack with a grocery pannier (the wire-looking kind that flattens out), and stick your backpack in there?

This is the bag I am thinking about getting, as I bring my bike into the office and don't really need to carry a backpack around.
http://www.calhouncycle.com/productc...idproduct=1085

Does anyone else use it? Do you like it?

Also, can someone recommend a good rear rack? I want something light but strong. The Planet Bike Eco Rack was recommended, but I would like some other opinions.

Sorry to hijack the thread.