Vacations are like life. It's better if you're trapped in one with someone else.
Lounging on a hotel balcony, looking up at the blue blue sky. Falling over in the lobby after a lovely drunken evening, Laughing and hushing each other before security appears. These things are all a little bit better if you have some extra room in your luggage to share with someone you don't hate. That's why a three-piece set will always be superior.