This is how I always have my USB flash drive with me.
I use one of the tiniest models available: KINGMAX Super Stick . Other manufacturers also have similar models. And there are card-readers for micro-SD of similar size.
The size and weight are extremely small — perfect for EDC, but the problem of finding the right place for it had to be solved. So I looked at stuff I always carry with me and found a fold in my wallet.
The last ingredient — velcro to attach the drive. For such a tiny drive it more than enough.
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Step 1: Materials
tiny USB flash drive
piece of velcro
thread, needle and a thimble
Step 2: Wallet Side
A thimble comes in handy when it comes to pierce leather.
Step 3: Drive Side
Use good knots.
Step 4: Done
Some photos of finished work.
(There are two different drives in photos. I used the white one for more than a year and was completely happy with the storage system. Recent upgrade of the drive and the wallet gave me the possibility to repeat the work and made this instructable.)