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SanDisk Cruzer Fit
Store up to 32GB is something not much bigger than your fingernail.
Not only are thee drives great when you want to pack the maximum amount of storage into the smallest space possible, but they are also great as additional storage for tablets, smart TVs and car stereos.
I have a few of these, and other than being easy to misplace/lose, there's not much wrong with them.
Price: Starts at $10 for 4GB.