When moving through airports, you may be asked about your equipment, I’ve had the internal barrels of my lens inspected for drugs by customs in countries such as Singapore and the Middle East. Don’t carry small tools such as Allen or hex keys, screw drivers, etc. in your carry-on luggage as these will result in delays and be confiscated by most custom officers.
What you're aiming for here is coverage over a broad focal length range as well as a decent overlap in your lens focal lengths.