Was looking into secure USB devices and decided on going with the IronKey basic. It sets up quick and easy, provides hardware encrypted storage, is waterproof, tamper proof (not sure if smoke will come out when it self-destructs!) and provides encrypted backup.
Not going to trust them totally, so not using their identity management or other on-line services.
If you need to keep a few files secure and want portability between work, home, travel this is worth a look. I haven’t tried it on a mac or linux, but it says it will support them as well.