Dr. Shereene Idriss's Must Haves: From Silk Pajamas to a Diaper Rash Cream

Dr. Idriss loves the functionality of the Tumi Just in Case Backpack ($150). In fact, she's had it for more than eight years. "It's a bag that folds into a pouch, and when you unfold it, it becomes a backpack," she says. "You can use it when you need it and hide it if you don't." She appreciates that it's lightweight, too. It has two compartments for organization, making it a perfect personal item on flights. It comes in five chic colors as well.

Pro Tip: When traveling, Dr. Idriss creates her own glycerin mist to keep her skin hydrated. She also recommends packing extra SPF for the plane.