I was driving home earlier tonight and I passed quite a few bicyclists who were not only riding down a one way street in the wrong direction, but also wearing absolutely NOTHING that made them noticeable at night. Argh. I try to look out for anyone on two wheels but it's definitely not easy when they're practically wearing all black. Scary.
I love my custom Timbuk2 bag, which I specifically chose reflective material for. It's also 100% waterproof and the perfect size. If you go to their website, you can customize it based on fit and laptop size. Lots of colors and fabrics to choose from too. You can even go ALL reflective! The material is day and night reflective, and sticks out like a sore thumb at night.
Ride Safe and Reflective!