I’ve found a Gerber Dime to be really handy when I can’t carry my Leatherman. I usually carry a lockblade knife, multitool, and Fischer space pen. Also have a USB drive on my keychain partitioned with NTFS (bulk storage) and Tails with persistence.

Had mine for a couple weeks now. Commenting in hopes someone else has some suggestions. Also, search thingiverse or cults3d for Cathedral. Looked like an interesting game.

What about Obsidian?