[Still Thinking]

Oh OK, so it's one of those real small SWA knives? I prefer to carry a full size pocketknife which pretty much forces you to carry it in-pocket, and I was picturing all the sludge that builds up in the bottom of the blade tracks getting into the USB plug.

For a USB stick (which goes in the pocket too, I try to keep the key-chain as light and unencumbered as possible) I used to use the Lexar "sport" models with a stretchy rubber cap, but have recently been using PNY ones with a plastic cap that seals pretty well.

[BushCountry]

This might be practical if you enjoy the finer malt beverages.