In 2026, the "universal standard" for carry-on luggage is strictly 22 x 14 x 9 inches (56 x 36 x 23 cm). This measurement must include the wheels, handles, and any side pockets. While some major carriers like Southwest remain more generous, most domestic and international airlines (American, Delta, United, etc.) have begun enforcing these dimensions more aggressively using automated gate sizers. The weight limit for carry-ons typically ranges from 7 kg (15 lbs) for international budget carriers to no specific weight limit for major US domestic airlines, provided you can lift the bag into the overhead bin unaided. Many luggage manufacturers now sell "2026 Compliant" bags that are slightly smaller than previous models to ensure they fit into the tighter overhead bins of modern narrow-body aircraft.