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I watch a ton of YouTube videos (acoustic guitar reviews, unboxings, etc.) I try not to watch guitar instructional stuff when away from my guitar but will spend time watching videos about theory like the circle of fifths or memorizing notes in a scale. I also have an app on my phone called ‘Fretonomy’ that has some games and activities to help memorize the fretboard and other things so I’ll use that. Also I got this D’Addario finger trainer thing which I always throw in my backpack and can use it anywhere in a few different ways. I also have a Taylor GS Mini that’s small enough for me to get in the car for any road trips (but I don’t fly with it).
Happy travels!
https://www.daddario.com/products/accessories/hand-fitness/varigrip/
fretonomy.com
Fretonomy is the best iOS and Android app to practice notes, chords, intervals, and scales on the fretboard on the guitar, bass, ukuelele, banjo, or mandolin.