When you're traveling for an extended period of time or even for a short trip, having comfortable boxers makes a huge difference. As you can see below, there is one major brand that dominates the travel underwear segment for men. That is ExOfficio. I'm not sure if this is because they have really high-quality products and the word just spreads? Or maybe it's because it was recommended by many travel and tech luminaries like Tim Ferris. He says he's traveled in a single pair only before.
I can attest to the fact that traveling with 1 pair is definitely doable. I've done it before. They dry very quickly and wash easily. If you are traveling, no matter the length of time traveled, having to only carry 2 pairs of underwear is perfect.
Below is a list of all the types of underwear that I think guys will need when they travel. Some are boxers type of guys, some are "briefs guys" and some like the boxer brief combination. Whatever type of underwear you wear, there are good travel ones you can get as well. The list below goes through some of the most popular ones listed on Amazon as well as a video review for each underwear so you can "kind of" see it in action.