Carry-on follows two sets of rules at once: the security requirements common to every airline, and the individual limits of each carrier and fare. Knowing the basics keeps you clear of nasty surprises at the desk — but the exact figures are still worth checking against your own ticket.
A typical carry-on allowance is 7—10 kg and roughly 55×40×20 cm, plus a separate personal item under the seat. Liquids follow the 100 ml rule in a clear bag. Every airline and fare sets its own limits, low-cost carriers especially. Check your flight's exact allowance in your booking details and on the carrier's website.
01 / BaselinesWhat counts as the norm
There is no single limit shared by every airline, but there is a familiar range most carriers stick to. Use it as a guideline when you pack, and take the final number from your ticket.
02 / Personal itemWhat you can take beyond the bag
Besides the main carry-on, most fares let you bring one small personal item that fits under the seat in front of you. It usually isn't weighed separately, but its size is still limited.
- Counts as a personal item — a handbag, a slim backpack, a laptop bag, a small briefcase.
- This is already the main piece — a full-size backpack or travel bag, even if it feels light.
- Often allowed on top — a coat, a foldable stroller, medication, baby food (confirm the rules with the carrier).
03 / LiquidsThe hundred-millilitre rule
This rule applies almost everywhere and is in force on all international flights. Liquids, gels and aerosols may travel in carry-on only in containers of up to 100 ml, packed in one transparent bag.
- 01Each container — up to 100 ml, and the package volume counts, not how much is left inside.
- 02All containers go in one zip bag of up to 1 litre, one bag per passenger.
- 03Exceptions — medication and baby food over 100 ml are usually allowed, but should be declared at screening.
04 / Before departureHow to verify your allowance
Open the booking in your account
Go to “My trips” and pick the flight. The carry-on allowance is shown next to the fare for each segment.
Cross-check the carrier's website
Limits depend on the fare, route and aircraft type. The airline's official page is the source of truth, especially for low-cost carriers.
Weigh and measure at home
Check the weight on kitchen scales and the size including wheels and handles — the gate sizer is stricter than a ruler.
In doubt — ask us
Message us in your account, via @sales_travel_bot, or call 8 800 1000-646 — we'll confirm the allowance for your fare.
05 / FAQFrequently asked
Can I take both a bag and a backpack into the cabin?
Usually yes: one main carry-on plus one personal item under the seat. But on low-cost basic fares the main piece is often paid for separately — check the fare terms.
What happens if my carry-on is slightly over the limit?
It's up to the carrier: you may be asked to repack, pay extra, or check the bag at the gate. To avoid it, keep a little margin on weight and size.
Does the 100 ml rule apply on domestic flights?
On most international and many domestic routes — yes. Screening rules are set by the airport and the country of departure, so it's safest to always assume the 100 ml limit.
Where can I see the exact allowance for my flight?
In your booking details under “My trips” and on the airline's official website. For specific carriers, our baggage allowance article helps too.