For most trips, two pieces of luggage will do the job: a
wheeled suitcase and a small backpack or personal bag. The wheeled bag lets the
ground bear the brunt of the load, and the small bag helps you keep important
items close. In the suitcase, pack things that you can afford to lose and that
can be replaced with relative ease. In the small bag, carry the essentials you
would need if your luggage was lost or damaged—clean underwear and a shirt, a
toothbrush, contacts or glasses, and your medications. Include some comfort
items as well: sunglasses, lip balm, a book, and a snack.
As for the really important things—money, credit cards, and
personal identification—disperse these throughout your belongings. Store your
passport and driver’s license in separate places (preferably with one of them
on your person), and put copies of your passport in both bags. If you have more
than one credit card, stash them separately.