Carry-On Luggage Restrictions

Most airlines have hard and soft limits on the amount of checked baggage and carry-on luggage they’ll let passengers take on flights. These restrictions can vary by class, elite status, type of ticket, and even flight origin and destination.

In the United States, most airlines allow one piece of carry-on luggage that measures 45 linear (length + width + height) inches or less. In addition, most domestic airlines allow a personal item, such as a purse, briefcase or daypack, to be carried in addition to your carry-on luggage. This is meant to give you plenty of space for important items like your laptop, medication and travel documents.

Liquids, gels and aerosols are restricted to 100 ml or less in carry-on luggage and must be packed in a quart-size, clear, plastic zip-top bag. This restriction stems from the failed 2006 transatlantic airline bomb plot, when terrorists tried to bring explosive liquids aboard planes disguised as drinks.

Tools, such as screwdrivers, wrenches and pliers, are permitted in carry-on luggage if they’re 7 inches or shorter from the tip of the blade. Knives and scissors, including nail clippers and pill cutters, are allowed in carry-on luggage if they’re no more than 4 inches from the pivot point of the blade.

Most airlines prohibit the carrying of sharp knives, but some will allow them in checked bags if they’re packed in a protective case or box. Check with your individual airline about their knife regulations. For international travelers returning to the United States, Customs and Border Protection may require that all fresh fruits, vegetables and meats be declared when entering the country.