Passengers are permitted to bring one personal item and one carry-on bag, in addition to a second carry-on bag, as long as the dimensions of that bag do not exceed 22 inches by 14 inches by 9 inches . This supplementary luggage may take the form of a carry-on suitcase, a duffel bag, or a backpack.

For most major full-service airlines (like United, Delta, or American), you are allowed one Standard Carry-on and one Personal Item. The standard carry-on size is typically 22 x 14 x 9 inches (56 x 36 x 23 cm), including handles and wheels. This bag goes in the overhead bin. The second item, the "Personal Item" (like a purse, laptop bag, or small backpack), must be no larger than 18 x 14 x 8 inches (45 x 35 x 20 cm) and must fit completely under the seat in front of you. In 2026, be aware that "Basic Economy" fares on some airlines may strictly limit you to only the personal item, with no overhead bin access allowed. International carriers may have slightly smaller dimensions, often 55 x 40 x 23 cm for the main bag and a weight limit (usually 7–10 kg). Always use the airline’s mobile app to check their specific "Sizer" tool, which often uses Augmented Reality (AR) to measure your bag using your phone's camera before you leave for the airport.