I don't know why this isn't mentioned more often, but hi-viz vests and jackets with EU spec reflecting material are available for only a few dollars from many suppliers. They pack very small, and go over any other gear. There are even mesh versions for the summer. What's nice about them is when the color is getting cruddy looking, you can replace them for very little money. And when you don't want the nerdy look, you don't have to wear them. And best of all, they easily out-perform the motorcycle jackets for visibility.