A passenger boards an aircraft with a bag small enough to fit in the overhead bin or under the seat. That bag is carry-on luggage. It stays with the traveler for the duration of the flight.

Airlines publish size and weight limits that vary by carrier and fare class. Security rules restrict liquids, sharp objects, and other items. Packing efficiently for carry-on only has become a common goal for short trips because it saves time at both ends of the journey.

Overhead bin space is limited and fills quickly on full flights. Gate agents sometimes force the last bags to be checked. Experienced travelers choose soft-sided bags that compress and keep essential items in a personal bag under the seat.

Traveling with only carry-on turns arrival into a simple walk off the plane.