I always wanted to add blinking LEDs to my bag so that cars and other riders can see me better at night, when i ride my bike.
These are the materials I used for this:
Blinking LED with batteries from radioshack. I also used 4 more LEDs, tape, some wire, solder, and solder iron.
I solder the wire directly to the radioshock LED circuit in parallel and then soldered LEDs to the wire in a parallel circuit.
I then slipped the lights inside the bag, made small holes for the LEDs to stick out and then hand sawed them in place to attach them.
so now I have a bag with blinking LEDs