3. Regular-sized bra
One more side-effect of flying by plane that many experienced travellers know about is light swelling. Few people think about the right underwear for the flight. However, a very tight bra can make the entire flight torturous — the straps will just press on your back and shoulders. The models with metal parts are also not the best idea. A metal scanner can see them at the airport. The best choice is a sports bra.