Airline Cabin Bag & Hand Luggage Size Calculator

Cabin Bag Guide

What do I need to know about Airline Cabin Bag Allowances 2026?

Ryanair: free small bag 40×20×25cm (fits under seat). Cabin bag 55×40×20cm with Priority (paid add-on or Plus/Flexi fares). easyJet: free under-seat bag 45×36×20cm. Overhead cabin bag 56×45×25cm with FLEXI or Up Front seat. Jet2: cabin bag 56×45×25cm, 10kg — included in all fares (most generous budget airline). British Airways: cabin bag 56×45×25cm + laptop bag or handbag. Hand luggage included in all fares. Wizz Air: free small bag 40×30×20cm. Cabin bag 55×40×23cm with WIZZ Go+ fare only. Note: airlines regularly revise these dimensions and fare-tier inclusions, so always check the specific current policy on the airline's own website shortly before travel rather than relying on older information.

Why Bag Fees Are So Expensive?

Budget airlines generate significant revenue from ancillary fees. Ryanair cabin bag fees (added at booking): typically £8-25 online. At the gate: £50-80. This is deliberate pricing — punish those who do not pre-add the bag at booking. Strategy: always add any required bag at the time of booking (cheapest). Check in online early for seat selection (affects bag priority). If travelling with just a free bag: pack using compression packing cubes to maximise the smaller allowance. The 40×20×25cm Ryanair free personal item allowance is deliberately tight, which is exactly why so many passengers end up paying for a larger cabin bag at the gate if they haven't planned ahead.

What do I need to know about Maximising Your Allowance?

Soft-sided bags expand to the maximum dimensions better than hard cases — a bag slightly above limit may pass if sides are soft and compressible. Airlines measure at their discretion — a bag that technically fits flat may be measured when upright. Wear heavy items on the plane (boots, jacket) — this reduces bag weight without increasing size. Use packing cubes: they compress clothing significantly and keep the bag organised. Liquids (100ml rule): all liquids must be in containers of 100ml or less, all fitting within a single transparent resealable bag, regardless of how much total liquid volume the containers could technically hold.

What should I know about Gate Bag Checks?

Airlines increasingly use bag sizers at the gate — particularly Ryanair and Wizz Air on busy routes. If your bag does not fit in the sizer: you will be charged to check it in the hold, at the gate, at very high prices (£50-80 typically). Avoid this: measure your bag accurately before travel, including any protruding wheels, handles, and pockets. A bag that measures 55×40×20cm with wheels is actually larger — measure the entire bag including external pockets, wheels, and handles in its fully packed condition, since gate staff measure exactly what you're carrying, not just the bag's stated dimensions.

What's the key thing to understand about Why Cabin Bag Dimensions Vary So Much Between Airlines?

There is no single international standard for cabin bag dimensions — each airline sets its own maximum size (and sometimes weight) limit for both the main carry-on bag and any separate personal item, based on factors including the specific aircraft types in their fleet (overhead bin dimensions vary between aircraft models) and their own commercial strategy around unbundled baggage fees. This means a bag that comfortably meets one airline's carry-on allowance can exceed another's, sometimes by a significant margin, even on what looks like a very similar route or flight — a particular risk for travellers on multi-airline itineraries or round trips booked with two different carriers, where a single bag might be compliant with one airline's limits but rejected on another leg of the same trip. Budget and low-cost carriers in particular have generally trended toward smaller permitted dimensions over recent years, often specifically to maximise revenue from passengers needing to pay for a larger cabin bag or a checked bag instead, while legacy full-service carriers have generally kept more generous, and more consistent, cabin bag allowances across their fleets. Always checking the specific airline's current published cabin bag dimensions for the exact fare and route being booked — rather than relying on a bag's past acceptance on a different airline, or a generic 'standard' carry-on size — is the only reliable way to avoid a bag being gate-checked or charged for unexpectedly at the airport.

What should I know about Sizing Gates and What Happens When a Bag Doesn't Fit?

Many airports and airlines use physical sizing frames or gates at check-in and boarding specifically to measure bags against the permitted limit, and enforcement has generally become stricter in recent years as more airlines rely on baggage fees as a meaningful part of their revenue — a bag that's even slightly over the limit, including the wheels and any external pockets or handles which some airlines' measurements include and others don't, can be flagged and charged for, or required to be checked into the hold instead, sometimes at a higher fee than if it had simply been booked as checked baggage from the outset. If a cabin bag is found to be oversized or overweight at the gate, the usual outcomes are paying an on-the-spot fee to check it into the hold (generally the most expensive way to check a bag, since it's priced as a penalty rather than a planned option), or in some cases being required to remove items to meet the personal item limit if only the main carry-on allowance has been paid for. Soft-sided bags that can be compressed to squeeze through a sizing frame are sometimes more forgiving than rigid hard-shell cases of exactly the same stated dimensions, since a slightly over-dimension soft bag can often still be compressed to pass a physical sizing check, while a rigid case at the same dimensions cannot — worth bearing in mind when choosing a bag specifically intended to maximise cabin bag allowance across multiple airlines with varying limits.

Worked Example: Checking One Bag Against Three Different Airlines

Suppose a bag measures 55cm x 40cm x 23cm. Airline cabin bag limits vary by carrier and change periodically, so always confirm current figures on the airline's own site, but as an illustration of how a single bag can pass with one airline and fail with another using commonly published approximate limits: an airline allowing up to 56 x 45 x 25 cm would accept this bag comfortably in every dimension. An airline allowing up to 55 x 40 x 20 cm would reject it, because the bag's height (23cm) exceeds that limit by 3cm, even though its width and length fit exactly. This shows why 'it fit on my last flight' is not a reliable guide for a different airline (or even the same airline's different fare tier) — one dimension exceeding a limit by even a few centimetres is enough for the bag to be rejected or charged for at the gate, regardless of how well it fits the other two dimensions.

Underseat vs Overhead Bin: The Second (Small) Bag Rule

Many airlines, especially budget carriers, allow one larger cabin bag that must fit in the overhead bin, plus one smaller 'personal item' (a small bag, handbag, or laptop bag) that must fit under the seat in front. The under-seat item is almost always the more restrictive of the two allowances, and gate staff increasingly measure it separately from the main cabin bag.

Travellers trying to maximise carry-on space sometimes assume both allowances can be packed as full-sized bags, but if only one 'free' item is actually permitted on a given fare, check the fare rules before travel rather than discovering the restriction at the gate, where a bag that doesn't fit the stated personal-item size is often charged at the (typically higher) gate rate.

What Happens When a Bag Is Gate-Checked

When a cabin bag clearly doesn't fit the sizer at the gate, airlines handle it in one of two quite different ways depending on why it didn't fit and how full the overhead lockers already are. If the flight is simply full of hand luggage, many airlines will gate-check bags for free as a 'last resort', tagging them to go in the hold and collecting them at baggage reclaim — inconvenient, since it adds a wait at the other end, but usually at no extra charge. If the bag itself is clearly over the airline's stated maximum dimensions or weight (rather than there just being no locker space left), the usual oversized-bag fee applies instead, often the same as if it had been flagged at check-in, and in some cases higher as a deliberate gate-check penalty. The practical lesson: a bag that's borderline on size is far more exposed to a fee than one that's correctly sized but simply caught in a busy flight — size compliance protects against the fee in both scenarios, while relying on 'no free lockers' luck does not.