The MoMA Store advertises these colorful aluminum Giorgio Fedon Mignon cases as being for any small item, like vitamins or coins, yet I love that they're shown encasing a flash drive in the photo.
It's a fabulous solution to the question of where to stash a USB stick when you're carrying it around — or even when it's just at home (you'd be surprised by how many places I have those things: junk drawers, desk drawers, jewelry boxes. . .). Some can fit on keychains, but the Mignon cases are an easy, efficient, and elegant solution — and under 15 bucks!