Originally Posted by catatonic
If you have a "loop" on the end of your seatpost bag, you can attatch some cateye lights to that loop using their belt clip option. If you cant find that clip, some of the cheap Bell rear lights have built-in clips that fit those bag loops.
That's exactly how I did it. When I ordered the bag, I was looking around on my bike for a place to put the light. Then it hit me that the logo on my bag wasn't just a logo, it was a loop.
Sometimes it's the most obvious thing that escapes us!