I had trouble with blinkies bouning off my bike. The clips aren't good enough to hold onto the flaps on my seatbag. I also can't use the seatpost mount because I have a saddlebag. Other locations are blocked by saddlebags.

So I put zip ties through the saddle rails and ran them through the blinkie's seatpost mount. An added benefit is that the zip ties absorb the shocks of the road, saving the blinkie.

I also added a backup blinkie to the saddlebag. I put a zip tie around the clip and ran that zip tie through a second ziptie that goes around the flap on the saddle bag.

I've decribed these before, but I finally have pictures:
ziptieseat.JPG

seatbagsaddlelight.JPG