Ask HN: Do you keep a “portables” thumbdrive?

I keep a thumb drive on my keychain. It contains many portable-version Windows programs in the event I need to use them on a computer that isn't mine, since I cannot assume installation privileges.

On it I have the following 'useful' programs:

7Zip, Firefox, Foobar2000, Hexchat, MPC-HC, Skype, TeamViewer, HashCalc, and Sharex

Included are also some niche, less practical programs 'just in case'. CCleaner, a Duplicate Photo Finder (called Awesome Photo Finder), Audacity, GifCam.

I also have a contact.txt file with an email address and my first name in the event I lose the thumb drive and a kind soul wishes to return it.

I'm curious of other people on HN carry around such a thumb drive - and what they have on it. It's always nice to be prepared, and maybe there is something that I may find myself needing that I hadn't thought about. :)

Quick note, I feel like there might be a lot of portable Linux installations and Tails thumb drives.