The way people pack for a trip has changed—and we’re not just talking about fashion microtrends. Ten years ago, a two-week stay in Paris meant jackets, loafers and one pair of shoes that could pass for running. Now the suitcase is half Lululemon, half low-profile trainers, because the run along the Canal Saint-Martin has been mapped and the hit at the Racing Club de France is on the calendar. Sports tourism is projected to reach roughly $928 bil…