I don’t leave home without it. I travel with a shotgun — Mic. It’s long and skinny and does an excellent job of recording my voice, just my voice, and not all of the other ambient sounds in the room.
But, you can’t be sure of the environment you’ll be in when you’re on the road, so you learn to create the best possible remote studio wherever you go. And a critical component is, (wait for it) the pillow.