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Carry-On Luggage: How to Choose Size and Weight for Air Travel

Learn the rules for carry-on luggage size and weight, the difference between carry-ons and personal items, and what to look for in materials and wheels.

By descobriu4 min readUpdated Oct 19, 2026
gray hardside luggage
Photo: Dimitri Karastelev / Unsplash

What is the allowed weight and size for carry-on luggage?#

When packing a carry-on for domestic flights regulated in Brazil, the general rule guarantees that passengers are entitled to bring up to 10 kg (around 22 lbs) into the cabin at no extra charge. However, the total dimensions must strictly comply with the measurements set by the airline.

If the bag exceeds the limits for height, width, and length, or the 10 kg limit, the passenger may be required to pay excess baggage fees. In addition, aircraft safety and space constraints may prompt the airline to gate-check the piece directly into the cargo hold.

What is the difference between carry-on baggage and a personal item?#

Many travelers confuse the primary cabin bag with the additional allowed item. The carry-on suitcase goes into the overhead bin, while airlines typically permit an extra personal item, such as a small backpack or purse, which must fit under the seat in front of you.

It is essential to keep fragile belongings, cash, and electronic equipment inside this personal item. Because larger bags in the overhead bins may be checked at the last minute due to limited cabin space, keeping documents and electronics under your seat prevents unpleasant surprises.

Read also: How to choose an ergonomic office chair

Hardside vs. softside: which luggage shell should you choose?#

Modern luggage construction aims to safeguard belongings using either a tough outer shell or resilient, flexible fabrics. While a hard shell offers better protection against compression and impact, softside fabrics expand and squeeze more easily into tightly packed compartments.

Another key structural feature is the arrangement of zippered interior compartments and dividers. Certain models also feature expansion zippers, boosting overall capacity when you need to bring home souvenirs or pack extra layers.

How to choose luggage wheels and handles#

Luggage mobility relies directly on the wheel system and the handle. Traditional luggage features two fixed in-line wheels, designed to be pulled behind you at a tilt. Contemporary options feature four 360-degree rotating wheels, commonly called spinner models.

Suitcases with four multidirectional spinner wheels and a retractable handle make navigating airport concourses effortless. You can glide them alongside or directly in front of you without bearing the bag's weight on your arm during long walks.

What precautions should you take when packing items and liquids?#

When packing your carry-on, remembering safety restrictions is critical. Explosives, sharp objects, and flammable items are strictly prohibited in cabin baggage, regardless of your destination or luggage style.

For travelers boarding international flights, strict regulations also govern cosmetics and liquids in the cabin. On these overseas flights, individual liquid containers larger than 100 ml (3.4 oz) are not allowed in carry-on bags.

Frequently asked questions#

What is the maximum weight for free carry-on luggage?#

Passengers are entitled to bring up to 10 kg in their carry-on bag at no extra charge, provided the suitcase also stays within the dimensions outlined by the airline in the carriage agreement.

Where should laptops and valuables be packed?#

Cell phones, laptops, and valuable items should preferably go in the personal item placed under the seat, as overhead luggage might need to be checked if the cabin runs out of room.

Can you bring large bottles of liquids in your carry-on?#

On international flights, liquid containers exceeding 100 ml are not permitted in carry-on bags. They must be packed in checked luggage or handled according to the airline's specific policies.

Keep reading#

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