The "Rule of 62" is the standard industry limit for checked luggage dimensions on most major airlines, including United, Delta, and American. It refers to the maximum total linear inches (length + width + height) allowed for a standard checked bag without incurring "oversized" fees. For example, a suitcase that is 30" tall, 20" wide, and 12" deep equals 62 linear inches. If your bag exceeds this limit, you can be charged significant surcharges, often ranging from $100 to $200 per flight. In 2026, with airlines increasingly strictly enforcing baggage rules to maximize cargo efficiency, it is vital to measure your suitcase including wheels and handles. This rule ensures that luggage can fit into the standard conveyor systems and cargo containers used globally, maintaining a streamlined handling process from check-in to arrival.