OCZ 2GB Mini USB
This is the most useful USB storage I have ever seen, its tiny as hell and its going for $84. Its small enough that it can fit inside your wallet inbetween the cards. The way it has been built it seems to be very durable, I’m assuming it isn’t waterproof but it will keep your files safe in your pocket or on your keychain. I think I will be getting this.
Link: UnCrate
3baid
Or you can get a regular thumb-sized USB storage that can also be attached to your keychain and costs a third of the price :P
mishref
I don’t think these usb key chains will be practical enough as the strap corner tend to be very fragile and get broken easily. Go for the swiss army usb key chain much cooler and more practical.
http://www.amazon.com/Victorinox-SwissMemory-2GB-Translucent-Ruby/dp/B000HLO8F0/ref=pd_sim_sg_1/102-3975462-8484126
Marzouq
3baid: this one is extremely thin!!!
mishref: I wouldn’t want to forget that I’m carrying a knife into the airport with me and there is important information! This one just looks useful and cool!