My girlfriend just got the Performance TransIt Metro pannier, which she likes a lot. It's the perfect size to hold a 13-15" laptop and a couple of books and smaller things. It converts between a messenger bag and pannier by covering up the hooks with a flap so you can carry it comfortably, and includes a waterproof cover. Seems to be well-designed and well-made, and it doesn't look half bad to me! It costs $50: http://www.performancebike.com/shop/...tegory_ID=2312