Becky posted this great video on CRAFT about making a pair of reflector flaps that tuck into your back pockets when you’re not using them and can be deployed when you’re ready to ride. The project uses the 3M Scotchlite Plus Retroreflective vinyl that she showed off on the bike episode of Make: Live. Awesome stuff. Below is a flash image of her bike with the reflective vinyl visible.
Reflector Pockets for Cycling