SanDisk claims that its Cruzer Blade is the world’s smallest USB flash drive. We believe it. The drive is “about the size of a standard size paper clip and weighing approximately the same as a penny.”
It’s perfect for hanging from your keyring, when not getting lost in the folds of your couch and such. It’s available in capacities from 2GB to 16GB, with prices from $14.99 to $77.99. When they say small they mean small, just not in price.
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Cruzer Blade, SanDisk, small, smallest, thumb drive, tiny, USB 
well a paper clip is to big, I believe this is the smallest one around.
http://www.slipperybrick.com/2009/04/eagletec-nano-48gb-flash-drive-is-tiny/#more-20617
and I got one, so tinny, you could swallow it, to prevent it from ending up in enemy hands.
Definitely agree with Chrome262. If it did get smaller than the EagleTec drive I don’t think I’d want it.