The 2026 carry-on standard is 22 x 14 x 9 inches (56 x 36 x 23 cm), including wheels and handles. This aligns with the IATA recommended universal size and matches the limit used by most major U.S. and international airlines.
What changed in 2026 is enforcement, not the size itself. United Airlines rolled out automated bag sizers at 35 airports in late 2025, with 80+ locations planned for 2026. Gate agents now measure bags more strictly.
Bags that fit overhead bins 5 years ago now get flagged as oversized because manufacturers designed for generous old limits. A “22 inch” bag from 2020 often measures 23+ inches with wheels extended.
Gate-check fees start at $60 and climb to $100 if paid at the gate.
See: free luggage calculator to check your bag and carry-on size limits by airline.