Most people buy luggage one piece at a time, then wish the rest of it matched. A set skips that. It's the carry-on for the quick trips, the checked case for the longer ones and the bag that ties them together, chosen once and made to travel as a group. Buying them together is simply the sensible way to do it. Start with a two-piece for the way most people travel, or build out to a full set in the sizes and colors that suit you, monogrammed if you'd like them to feel properly yours. Every luggage piece shares the same wheels, the same handles and the same lifetime warranty on luggage manufacturing faults, so a set reads as one considered choice rather than three separate ones. 100 Day Luggage Returns, in case the fit isn't right.