Lazermonkey.....
I only put a single twenty into it but I'm certain that you could probably fit more. Obviously if you roll up a 'c' note you'd have the $100, but it is a large denomination. I haven't played around with it much yet (it is on my honey's key chain), but you should at least be able to 'squeeze' in another bill.

I got it for just about the same reason you gave in the story. It's more the Oops factor than true "survival" but either way you could be "stuck" in a bad way. <img src="/images/graemlins/blush.gif" alt="" /> I wanted to make sure she had some cash that wasn't always remembered but always there. Ane it takes a little bit to get it out so you're not tempted to 'dip' into it for ie. a soda or chocolate bar....though a chocoholic without chocolate IS a true emergency <img src="/images/graemlins/grin.gif" alt="" />

Glad it helped.