How Carry-On Luggage Size Rules Actually Work Across Airlines

Few things spoil the start of a trip like being told at the gate that your bag is too big. Carry-on rules are not standardized, and the same bag can be fine on one airline and charged on another. Understanding how the rules are structured helps you avoid surprises.

Two kinds of cabin bags

Most airlines separate cabin luggage into two items:

• A personal item, such as a small backpack or handbag, that must fit under the seat in front of you.
• A standard carry-on, such as a small wheeled case, that goes in the overhead bin.

On many low-cost airlines and basic fares, only the personal item is included. The larger carry-on costs extra, even if it fits the size limit.

Size and weight limits

Many full-service airlines set carry-on limits of roughly 55 x 35 x 20 cm or 56 x 36 x 23 cm (about 22 x 14 x 9 inches), including wheels and handles. Personal item limits are usually much smaller and vary more between carriers.

Weight rules are where airlines differ most. Some have no weight limit for carry-ons, while many others set one, commonly somewhere between 7 and 10 kg. Airlines that do weigh bags may check them at the counter or the gate.

What to check before you fly

1. Look up the baggage page for your airline and your specific fare type, not just the airline in general.
2. Measure your bag when it is packed, including wheels and handles.
3. If your trip has several flights on different airlines, pack for the strictest rule.
4. Consider buying extra baggage online in advance, which is usually cheaper than paying at the airport.

Packing tips that help

• Wear your bulkiest shoes and jacket rather than packing them.
• Choose a soft bag, which is easier to fit into sizers than a rigid case.
• Keep liquids in a clear bag that follows airport security rules for your departure country.

Rules change often, so treat these figures as a general guide and confirm the current limits with your airline shortly before you travel.