For whatever reason I have yet to actually go out and buy a USB flash drive. Part of me thinks that I can get away without carrying one, which has proven untrue as I constantly find myself in situations where it would be handy. I think the real reason is that I haven't found one that is small enough without looking like it will break or I will not lose the cap.
The FLX flash drive is the first one that I think satisfies both of my main needs. The casing is an accordion styled silicone which provides a case while maintaining a very smalle size. Hopefully this protoype makes it into production.