In my experience there are two kind of travel.. the kind where you stay (and shave) in a hotel, and the kind where you’re happy to have time and water to shave with…
My kit don’t changes too much between the two, and the only real difference is the razor. For the former, I have a nice vintage Gillette khaki set from 1918, for the later I have a Merkur 985CL open comb travel razor. They are both nice razors, but I would feel quite bad if my Khaki went missing or broke.
As for the rest… a travel sized aftershave, a shavestick, a travel brush, some beard oil, alum and blades. Everything you need for a moment of zen away from home.