I read in a thread here a while back that some people carry the Douk-Douk (the smallest version) in their wallets.
Its certainly thin and short enough.
I already have the full sized douk-douk which i like very much.
When i make an order from EDC i'll have to get the small one too and try it out.
Currently i carry a swisscard and an eze-lap credit card sized sharpener.
I think you could fit one of those small ferro rods in there too.
I just saw the new swisscard, now it has an LED and a magnifier!
I may need to upgrade,lol!
I bought one of those starflash mirrors, its great but way too thick for a wallet!
Anybody know a good make of survival mirror thin enough for wallet carry?