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 largest carry-on suitcase allowed on most major airlines (including Delta, United, and American) follows a strict standard of 22 x 14 x 9 inches (56 x 36 x 23 cm), including handles and wheels. Southwest remains an outlier, allowing slightly larger bags at 24 x 16 x 10 inches. For checked luggage, the universal limit is typically based on "total linear dimensions" (length + width + height), which must not exceed 62 linear inches (158 cm). Exceeding this size usually triggers an "oversized baggage" fee, which can range from $100 to $200 per flight. Weight is the other critical factor; most domestic and international carriers cap standard checked bags at 50 pounds (23 kg) for Economy passengers. It is vital to note that budget airlines like Spirit or Ryanair often have even smaller free allowances, so always use a digital scale and a tape measure before heading to the airport to avoid surprise gate fees.