Airline Carry-On Size Comparison: 8 Major Airlines Checked (2026)

The comparison that matters: size, weight and inclusion

This table compares the ordinary adult economy allowance described on each airline's own baggage page, checked on 12 August 2026. Route, aircraft, fare, status and codeshare exceptions can change the result for a specific booking.

Two things jump out. First, "standard" width alone ranges from 35cm (United) to 45cm (British Airways and easyJet's large cabin bag), a 10cm spread that can sink a bag that was "fine" on the outbound leg. Second, weight is not a footnote: Singapore Airlines, Qantas and Air India cap economy cabin baggage at 7kg, a limit that a mid-size hard-shell case can approach before you've packed anything inside it.

Why "standard cabin bag" is misleading

Retailers routinely sell a suitcase as "cabin approved." Airlines do not recognize or enforce a universal retail standard; each one publishes its own numbers, and those numbers disagree with each other by several centimetres and several kilograms.

Three separate tests apply on every flight:

1. External size. Wheels, handles and bulging pockets count toward the measured dimensions.
2. Weight. A physically small bag can still fail a 7kg limit once it's packed.
3. Entitlement. The bag may fit the sizer but still not be included in the fare you bought.

A fourth test shows up specifically on connecting itineraries: the airline operating the next sector may enforce a smaller allowance than the one that sold you the ticket.

Airline-by-airline notes

United

United publishes an overhead limit of 9 × 14 × 22in, or 23 × 35 × 56cm, and a personal-item limit of 9 × 10 × 17in, or 22 × 25 × 43cm. For most trips a carry-on and a personal item are free, but United states that many Basic Economy itineraries allow only the personal item. Published exceptions exist, so check the fare display for the specific route before you fly.

British Airways

British Airways allows a cabin bag up to 56 × 45 × 25cm and a handbag or backpack up to 40 × 30 × 15cm. The passenger must be able to lift the cabin bag into the overhead locker unassisted. BA also warns that the larger bag may need to go into the hold on a full flight, so valuables, electronics and essential medicine belong in the guaranteed under-seat item, not the bigger bag.

Singapore Airlines

Singapore Airlines permits one economy or premium-economy cabin piece up to 7kg, with length plus width plus height no more than 115cm total. A linear total is less protective than three separate side limits: a long, narrow object can stay under 115cm added together while still being an awkward shape for the overhead bin.

Qantas

For international economy, Qantas publishes one overhead bag plus a personal item, with a 7kg maximum on the overhead piece. Its standard overhead dimensions are 56 × 36 × 23cm. Qantas also states that flights departing India have different item rules, and that mixed Qantas, Jetstar or partner itineraries should be packed to the lowest allowance among the carriers involved.

Ryanair

Ryanair includes one 40 × 30 × 20cm under-seat bag in every fare. A larger 55 × 40 × 20cm, 10kg overhead bag is tied to Priority & 2 Cabin Bags or another eligible purchased option; it is not automatically included. Ryanair states that an oversize cabin bag can be refused at the gate or placed in the hold for a fee. The question that matters here isn't just "does it fit?"; it's "is it on the booking?"

easyJet

easyJet includes one under-seat bag up to 45 × 36 × 20cm in every fare. It can weigh up to 15kg, but the passenger must be able to lift it themselves. A large 56 × 45 × 25cm cabin bag comes with eligible fares, seats, memberships, or a separate purchase, subject to the airline's conditions and available space.

Emirates

Emirates currently publishes an economy carry-on size of 55 × 38 × 22cm and a 10kg weight limit on the cited US page. Route and cabin differences exist, so check the locale-specific and itinerary-specific baggage display rather than assuming the US figures apply everywhere.

Air India

Air India publishes 55 × 40 × 20cm, up to 115cm total, and a 7kg limit for economy and premium economy. First and business class carry a higher weight allowance under the same published policy.

The conservative mixed-airline bag

Taking the smallest maximum for each side across this eight-airline sample gives a single conservative footprint:

• Height: 55cm
• Width: 35cm
• Depth: 20cm

So 55 × 35 × 20cm is the conservative intersection of the published three-dimensional overhead limits among the sampled airlines. Added together that's 110cm, comfortably inside Singapore Airlines' 115cm linear total as well.

That's a benchmark, not a guarantee. Singapore Airlines measures on a linear total rather than three fixed sides, fare inclusion can still fail even when size doesn't, and smaller aircraft can impose their own operational constraints on top of the published policy. A soft bag that compresses safely has more real-world tolerance than a rigid case sitting at the exact boundary.

Weight is often the real constraint

A 55cm roller bag can exceed a 7kg limit quickly, before you've even finished packing. For context, illustrative weights for common items look roughly like this:

These are illustrative ranges, not measurements taken by SuiteScanner, so treat them as a sanity check rather than a spec. The only reliable method is to weigh the fully packed bag on a scale before you leave for the airport. If the airline's allowance is 7kg and the empty case alone weighs 3kg, only 4kg of actual belongings remains before you're over the limit.

Under-seat versus overhead

An under-seat allowance is not just a smaller wording for the same right; it's a separate category with its own rule, and on some fares it's the only free baggage you get. It must fit below the seat in front of you, and on Ryanair and easyJet base fares it can be the only complimentary item included.

Before you fly, check:

• The maximum dimensions for the under-seat item specifically, not the overhead bag.
• Whether a second, larger overhead bag needs to be purchased separately.
• Whether a laptop bag or handbag counts as a separate item or is absorbed into the personal-item allowance.
• Exit-row rules, where under-seat stowage may be unavailable during take-off and landing.

Codeshares and mixed tickets

A flight sold by one airline can be operated by a different one entirely. Always read the "operated by" line on the itinerary for every sector of the trip: the baggage rules that apply are the operating carrier's, not necessarily the marketing carrier's.

Before departure on a mixed or codeshare itinerary:

1. Open each operating airline's baggage page individually.
2. Check what's actually included in the fare class you bought for each sector.
3. Apply the smallest dimensions and the lowest weight limit among every carrier on the trip.
4. Check for aircraft-specific notices, since smaller regional aircraft can have tighter bin space.
5. Screenshot the baggage allowance attached to the booking before you travel.

Gate-check risk and essential items

Even a bag that's fully compliant on size and weight can still be gate-checked once the overhead bins fill up on a busy flight. Keep passports, medicine and other valuables in the under-seat item rather than the larger overhead bag, so they stay with you even if the bigger bag ends up in the hold. Spare lithium batteries and power banks generally need to be removed from any bag that goes into the hold; see our power bank rules for flights guide for the current count, capacity and packing rules.

Buying a cabin suitcase

Don't filter shopping results only by a "cabin approved" label; verify the manufacturer's actual external dimensions, including wheels and handle housing, plus the bag's empty weight before you buy.

For a bag meant to work across multiple airlines, prioritize:

• No more than 55 × 35 × 20cm, based on this sampled benchmark.
• Low empty weight, since that eats directly into a 7kg allowance.
• Compressible external pockets rather than rigid ones at the exact boundary.
• Clearly and honestly measured external dimensions from the manufacturer.
• A separate under-seat bag sized to the strictest personal-item rule you expect to encounter.

Myths, debunked

"A bag labelled 'cabin approved' will fit on any airline."

No. Airlines don't share one retail standard. United's published width is 35cm and Qantas's is 36cm, while British Airways and easyJet's large cabin bag allow 45cm, and a retailer's generic "cabin approved" label doesn't reflect any one of these numbers specifically.

"If my bag fits the sizer, it's automatically free to bring."

Not necessarily. Ryanair's overhead bag requires Priority & 2 Cabin Bags or another eligible option, and easyJet's large cabin bag requires an eligible fare, seat, membership or separate purchase. Fitting the sizer and being included in your fare are two different questions.

"55 × 40 × 20cm is a safe, universal size."

No. United's published width is 35cm and Qantas's is 36cm for the standard overhead bag, so a 40cm-wide bag can exceed those limits even though it satisfies airlines with a more generous allowance.

Frequently asked questions

Methodology

We reviewed eight official airline baggage pages on 12 August 2026 and normalized the allowance for an adult economy passenger on each. Dimensions include wheels and handles where the airline specifies this. A paid overhead bag is not coded as free; inclusion in the base fare is tracked as its own field, separate from size. Where an airline uses a linear total rather than three fixed sides, or applies route-specific rules, that limitation is stated rather than smoothed over. This is a sample of eight major carriers, not a claim to cover every airline or every fare.

Sources

• United
• British Airways
• Singapore Airlines
• Qantas
• Ryanair
• easyJet
• Emirates
• Air India