This seems like a no-brainer, but so do many good ideas after the fact. This password-protected flash drive ($60) clocks in at 4, 8, 16, and 32 GB, but the main feature is the keypad. Basically, you plug it in to a USB 2, type in your pin, and you’re good to go. It automatically locks when you eject. Oh, and in case you’re wondering, it’s protected by AES 256-bit encryption, which is the Cadillac of encryption. Basically, the NSA can crack it, but no one else can. To brute force it, you’d have to have the world’s most powerful supercomputer run for all of existence to get there.