If you're traveling by air and dedicated to your carry-on, consider the advantages of checking your luggage. The risk of delayed or lost baggage is actually very small, and the freedom of movement gained during your journey is often worth the risk, particularly if you'll have layovers in crowded airports. Think about possible delays and decide if you're up to hauling those carry-ons everywhere you go. Planes (and overhead compartments) are going to be at their fullest capacity.