There is normally a maximum weight limit of 50 pounds per checked bag as well as a size restriction. The most common maximum size bag allowed is 62 linear (total) inches. A common size bag for checking through is: 27 x 21 x 14.

In 2026, the standard weight limit for a single checked bag on most major airlines is 50 pounds (23 kg) for Economy and Premium Economy passengers. However, there is a "hard limit" of 70 pounds (32 kg) that applies to almost all commercial aviation globally. This 70-lb cap is an international health and safety regulation designed to protect baggage handlers from injury; any bag exceeding this must typically be shipped as cargo or split into two pieces. If you are flying in Business or First Class, or if you hold elite frequent flyer status (like Delta Diamond or United 1K), you are often granted an allowance of up to 70 lbs per bag for free. For budget carriers like Frontier or Spirit, the limit is often lower, sometimes starting at 40 pounds (18 kg), with steep fees for every pound over. Always check your specific ticket confirmation, as "Basic Economy" fares may have different rules. If you go over the 50-lb mark on a standard ticket, expect to pay "heavy bag" fees that can range from $100 to $200 depending on the airline and the length of the flight.