This is somewhat hypothetical because I don’t travel that often so I haven’t actually traveled with all of these. But this is what I’d pack:

• Next Station: London: great roll & write with a nice compact flap box. Works for solo.
• Sea Salt & Paper: one of our current favorites, small box, easy to teach
• Scout: ditto
• Orchard: My small comfort solo
• Some Buttonshy games. Maybe some Pack O Game ones too.

Easy to teach can be an important consideration in case you find some new people to play with.