The joys of traveling can come with physical setbacks, such as dehydration, risk of catching a bug from a fellow passenger, exhaustion and jet lag. Celebrities Gwyneth PaltrowJessica AlbaPharrell and Idris Elba are constantly hopping on planes and jetsetting around the globe. So it only makes sense that they would know how to stay organized, hydrated, fit and relaxed during their travels. Before you pack for your summer voyage, take a look at these celebrities’ tips for healthy, happy travel.