Travel topic · Transport
Carry-on vs checked bags: what fits
Go carry-on only for trips up to about a week in warm weather, or when you fly budget airlines and short connections; check a bag when you need liquids over 100 ml, sports or camera gear, or more than 7 days of cold-weather clothing.
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What actually fits in a carry-on, when a checked bag pays for itself, how the budget-airline fee ladder works, and the packing rules that keep you out of the oversize queue. Written for 2026 fares and cabin limits.
Key facts
- Typical carry-on sizecheck
- 55 × 40 × 20 cm (21.6 × 15.7 × 7.9 in) on most full-service airlines; budget carriers often 55 × 40 × 20 cm but weight-capped at 7–10 kg
- Typical checked allowancecheck
- 23 kg (50 lb) on full-service economy; 20 kg on many leisure and charter fares; 15 kg on some Asian and European low-cost fares
- Liquids in cabincheck
- 100 ml (3.4 oz) per container in a 1 L clear bag at most airports; some scanners now allow more — check the airport
- Checked bag fee, first bagcheck
- Often 0 on full-service long-haul; roughly USD 30–40 domestic US, GBP 20–45 short-haul Europe, USD 20–60 Asia low-cost, when bought online in advance
- Fee at the airport vs onlinecheck
- Airport counter purchase can cost 1.5–2× the online price on low-cost carriers
- Weight overagecheck
- Charged per kg on many carriers, commonly USD 10–30 per kg; repacking at the counter is usually allowed before payment
- What forces a checked bag
- Knives, tools, most sports gear, liquids over 100 ml, and anything the security officer decides is not cabin-safe
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Short answer
Carry-on only wins when the trip is short, the weather is warm, and you are flying a route where a checked bag costs extra. A mid-size cabin bag — roughly 40 L, in the region of 55 × 40 × 20 cm — is a workable target for about a week of summer clothing for one person if you pack to a list and do laundry once. Treat those numbers as an illustration, not a universal allowance: cabin size and weight limits differ by airline, aircraft and fare, and some carriers cap cabin weight at 7–10 kg. Check your own carrier's published limits before you pack.
Checked wins when the trip is longer than about 10 days, when you need boots and a jacket, when you carry camera, dive or climbing gear, or when you are moving between several climates. It also wins on long-haul full-service tickets where the first bag is already included — you have paid for it in the fare, so using it costs nothing extra.
The honest middle ground for many travellers is one carry-on plus one checked bag on the way out, and carry-on only on the way home if you can post or discard what you bought. That keeps the arrival flexible and the return cheap.
| Trip shape | Carry-on only | Checked bag |
|---|---|---|
| 3–7 days, warm, one city | Yes | Not needed |
| 7–14 days, mixed weather | Possible with laundry | Easier |
| 14+ days or two climates | Hard | Yes |
| Budget airline, short hop | Yes — fees are high | Only if you must |
| Long-haul full-service | Fine | Often free, so use it |
| Gear-heavy (dive, ski, camera) | No | Yes, plus excess cover |
Weights and fees vary by carrier and route; confirm on your booking before you pack (check).
Do
- Weigh your packed bag at home on a luggage scale; bathroom scales are unreliable below 5 kg.
- Photograph the packed contents and the bag itself before you fly — useful for insurance claims.
What actually fits in a carry-on
As a rough example, not a guaranteed capacity: a mid-size cabin bag in the region of 40 L might hold about 5–7 tops, 2 pairs of trousers or 1 trousers plus 1 shorts, 7 sets of underwear and socks, 1 light jacket, 1 pair of shoes worn on the plane plus 1 packed pair, a toiletry kit under 100 ml per container, chargers, and a laptop or tablet. That is a plausible week in a warm climate with one laundry stop — your own bag, packing style and the airline's weight cap will decide the real number.
The volume killers are shoes, towels, jeans and anything with structure — a hard-shell hat, a hairdryer, a second pair of boots. If you must take boots, wear them on the plane. If you must take a towel, take a microfibre one. Jeans take two days to dry in a hotel sink; travel trousers dry overnight.
Compression cubes buy you maybe 15–20 % more space, mostly by flattening soft items. They do not change the weight, and on weight-capped budget fares weight is the binding constraint, not volume. A 7 kg cabin limit is tight once you add a laptop and a pair of shoes, so weigh the packed bag rather than trusting the volume.
| Item | Carry-on (rough example) | Checked (rough example) |
|---|---|---|
| Tops | 5–7 | 10–14 |
| Trousers / skirts | 2 | 4–5 |
| Shoes | 1 packed + 1 worn | 3–4 pairs |
| Liquids | Per airport rule | Full size |
| Jacket | 1 light | 1 heavy + 1 light |
| Laundry needed | Every 5–7 days | Every 10–14 days |
Rough examples for one adult in warm-to-mild weather, not a guaranteed capacity; your bag and your airline's weight cap decide (check).
Do
- Roll soft items, fold structured ones; put socks and underwear inside shoes.
- Wear your heaviest layer and bulkiest shoes on the plane, every time.
- Keep one small pouch with passport, charger and medication at the top of the bag.
Watch out
- A bag that is 2 cm over the sizer can be gate-checked and charged; measure the bag with the wheels and handle included.
Show 6 sectionsHideCosts: when a checked bag pays for itself, Rules that catch people out, Exceptions and edge cases, What to do before you travel, Questions people ask, Related
Costs: when a checked bag pays for itself
On full-service long-haul economy, one checked bag of about 23 kg is often included in the fare. On domestic US flights and short-haul Europe, the first checked bag is normally charged, and the price depends on the airline, route, season and how far ahead you buy. Published fee bands move every year, so check your carrier's current baggage page rather than budgeting from a general figure (check).
The trap is buying at the airport. Low-cost carriers commonly charge more at the counter than online, and some charge per kilogram for anything over the allowance. A small overage on a 20 kg allowance can cost more than the bag itself. Repacking at the counter to drop below the limit is usually allowed before you pay, so keep a tote bag in your carry-on for exactly that.
Run the maths before you book. If the carry-on fare plus a checked bag is close to a full-service fare that includes a bag, the full-service ticket is often the better buy because it also includes seat selection, food and a rebooking path when things go wrong. If the difference is larger, the low-cost fare plus one bag is still cheaper.
| Region / carrier type | First checked bag, online | At the airport |
|---|---|---|
| US domestic, mainline | Check carrier | Check carrier |
| US low-cost | Check carrier | Check carrier |
| Europe short-haul low-cost | Check carrier | Check carrier |
| Asia low-cost, 20 kg | Check carrier | Check carrier |
| Full-service long-haul | Often included | Often included |
| Overage per kg | Check carrier | Check carrier |
Fees vary widely by airline, route, season and how far ahead you buy; confirm on your carrier's baggage page before booking (check).
Do
- Buy the bag at the same time as the ticket; adding it later is often more expensive.
- Check whether the fare includes a personal item only, a cabin bag, or both — the words differ by airline.
- On a multi-airline itinerary, each carrier's rules apply to its own leg.
Rules that catch people out
Cabin liquid limits are not the same everywhere. Many airports still apply a 100 ml (3.4 oz) per-container rule with a single clear bag, while airports with newer CT scanners may allow larger containers — and the rule can differ between your departure airport and your destination. Do not assume the looser rule applies: check the current guidance from your airport and your airline, and pack anything larger in the checked bag, sealed in a plastic bag in case it leaks.
Batteries are the other big one. Spare lithium batteries, power banks and e-cigarettes must travel in the cabin, not in checked bags, on essentially every airline. Power banks also carry a watt-hour cap, but the exact limit and the approval process differ by airline and by country, so confirm the current figure with your carrier before you fly. Check the Wh printed on the pack; if it only shows mAh, divide by 1000 and multiply by the voltage (usually 3.7 V).
Sharp objects, tools, sporting goods and most liquids over the cabin limit go in the checked bag. Medication, passports, jewellery, laptops and anything you cannot replace should stay with you — checked bags are handled by machines and can be delayed for days. If you check a bag, put a copy of your itinerary and a phone number inside it.
| Item | Cabin | Checked |
|---|---|---|
| Liquids over the cabin limit | No | Yes |
| Power bank / spare lithium battery | Yes (Wh-capped — check airline) | No |
| Knife, multitool | No | Yes |
| Laptop, camera body | Yes | Yes, but risky |
| Medication | Yes | Not recommended |
| E-cigarette | Yes | No |
Airline and country rules vary; confirm with your carrier and your departure airport (check).
Do
- Photograph your bag and tag it with a name and phone number on the outside.
- Keep medication, one charger and one change of clothes in your carry-on even when you check a bag.
Watch out
- Never pack spare lithium batteries or power banks in a checked bag.
- Do not lock a checked bag with a non-TSA lock on US-bound flights; security may cut it.
Exceptions and edge cases
Some routes and carriers are stricter than the global norm. Several Asian and European low-cost carriers weigh cabin bags at the gate, not just at check-in, and charge if you are over. A few airports require cabin bags to be tagged at check-in before security. On small regional aircraft, even a legal carry-on may be taken at the gate and returned on the jet bridge — that is normal and not a fee.
Families, medical equipment and mobility aids have separate rules that differ by airline. Strollers, wheelchairs, CPAP machines and similar items are often carried at no extra charge, but the conditions, notice periods and whether they are gate-checked or carried in the cabin vary — confirm the policy with your airline before booking rather than assuming.
Cruise and rail travellers have different constraints again. On a cruise, you can usually take far more luggage than a flight allows, but you must carry it yourself on and off in some ports. On trains in Europe and Japan, large suitcases need a reservation on some services, and overhead racks are smaller than a plane's. If your trip mixes a flight with a cruise or a long rail leg, pack for the tightest leg.
Do
- If you are close to the limit, wear a jacket with big pockets and put heavy small items in them.
- For a cruise plus flight, consider shipping a bag ahead rather than paying airline excess.
What to do before you travel
Check the exact cabin and checked limits for every carrier on your itinerary, including codeshares, and note whether the fare includes a personal item, a cabin bag, or both. Measure your bag with wheels and handles. Weigh it packed. Buy any checked bag online at the time of booking rather than at the airport.
Pack to a list, not to a feeling. Lay everything out, remove a third, then pack. Put a change of clothes, medication, chargers and documents in the carry-on even if you check a bag. Photograph the contents and the bag. Label the outside and put a copy of your contact details inside.
Finally, check your travel insurance for baggage delay and lost luggage cover, and know the airline's liability limit — it is usually far below the value of a laptop and camera. If you carry expensive gear, a separate policy or a home-contents extension is usually cheaper than relying on the airline.
Do
- Set a phone reminder to buy the checked bag before check-in opens; prices often rise closer to departure.
- Keep boarding passes and bag receipts until your claim window closes.
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Questions people ask
Carry-on vs checked bags: what fits: what do I need to know?
A 40 L carry-on at 55 × 40 × 20 cm holds about a week of warm-weather clothing for one person. Check a bag when you need liquids over 100 ml, boots or gear, or more than about 10 days of clothing. On full-service long-haul fares the first 23 kg bag is often included; on low-cost carriers it is charged and cheapest online in advance.
What are the most common mistakes?
Buying the checked bag at the airport instead of online, packing power banks in a checked bag, assuming the cabin size limit is the same on every airline, and not weighing the bag before leaving home. Gate weighing on low-cost carriers is common and the fee is charged on the spot.
What should I do before I travel?
Check each carrier's cabin and checked limits, measure and weigh your packed bag, buy any checked bag online when you book, keep medication and documents in the carry-on, photograph the bag and contents, and confirm your insurance covers baggage delay and loss.
Is a carry-on always cheaper?
No. On long-haul full-service fares the checked bag is already in the price, so carry-on only saves nothing. Carry-on wins on low-cost and short-haul routes where the bag is a separate fee, and on tight connections where a delayed bag would cost you a day.
Can I take a power bank in a checked bag?
No. Spare lithium batteries and power banks must go in the cabin on essentially every airline, usually capped at 100 Wh without approval and 160 Wh with airline approval. Check the Wh printed on the pack.
How much does an overweight bag cost?
Commonly USD 10–30 per kilogram over the allowance on low-cost carriers (2026 estimate). Repacking at the counter to get under the limit is usually allowed before you pay, so keep a tote bag in your carry-on.
Deep dive
Every source; changeable facts are marked check and were last checked Jan 2026
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Sources
- officialIATA – Passenger baggage standards and guidance
- officialTSA – What can I bring?
- officialUK CAA – Baggage and security
- officialEASA – Aviation security rules for passengers
- secondaryWikivoyage – Baggage
- secondaryWikivoyage – At the airport