It depends on where I'm going. If it's truly a road trip and thus no flying (and no TSA) then it will usually be one of my normal EDC folders, most likely something unassisted that won't generate any headaches if I have to explain my reason for carrying it. Something that suggests "hardware store" like a Leatherman Crater is my preference in that case. The answer changes quite a bit if I'm on a hiking trip, or going to be walking around someplace where I want something for defensive use but can't carry a firearm. Then it's most likely a sheathed folder like a Gerber Gator or Benchmade Adamas for the former, or a Kershaw RJI (a personal favorite) for the latter.