In 2026, luggage sizing has become more standardized across the aviation industry to combat the "carry-on crunch." For carry-on bags, the most common global standard is 22 x 14 x 9 inches (56×35×23 cm), which must include wheels, handles, and side pockets. Most major airlines like Delta, United, and American strictly enforce these limits using automated scanners at the gate. Personal items (backpacks or purses) generally must fit within 18 x 14 x 8 inches to go under the seat. For checked luggage, the standard limit is a total linear dimension (length + width + height) of 62 inches (158 cm), with a weight cap typically set at 50 lbs (23 kg) for economy passengers. If you are flying on budget carriers like Spirit or Ryanair, be aware that their "standard" carry-on is often smaller or requires a significant additional fee, making it vital to measure your bag from the very bottom of the wheels to the top of the retracted handle to avoid surprise gate-check fees that can now reach $100 in some regions.