I, too, carry my urban kit as much as for convience as survival. Your key chain set up is identicle to mine, except I have a Fox 40 whistle, which I would recomend switching to. Also, a good locking knife would be a great addition to a good kit. Some 550 cord would also be good.

As an aside, can you explain to me what a "threader" is? I've seen several people mention them, but I have no idea what one is.

Thanks,
Chris.