Cabin baggage rules aren't standardised across airlines, and the differences are bigger than most travellers expect - a bag that sails through with one airline can be flagged as oversized on another, even though both fall under the vague umbrella of "carry-on." For anyone booking a hard-won cheap or student fare, getting caught out at the gate with an unexpected baggage fee is exactly the kind of thing that can wipe out the saving you worked to find in the first place.
This guide breaks down cabin baggage allowances across major partner airlines, explains the difference between a cabin bag and a personal item, and covers what actually happens if your bag doesn't fit - plus how to avoid finding out the hard way. Whether you're booking a single short-haul trip or planning several separate flights across a longer itinerary, the same underlying rules apply, though the stakes for getting it right are higher the more flights you're juggling.
There's no single "standard" cabin bag size
IATA, the industry body that sets many airline guidelines, recommends a maximum cabin bag size of 55 x 35 x 20 cm as a general guideline - but this is only a recommendation, not a binding rule, and most airlines set their own limits that differ from it in at least one dimension. Some are more generous on depth, some cap weight far lower than others, and several distinguish sharply between what a "basic" fare includes versus what a standard or flexible fare allows. The result is that assuming your bag will be fine everywhere because it fit last time, on a different airline, is a genuinely common way travellers end up paying an unplanned fee.
Cabin bag versus personal item: the distinction that trips people up
Most airlines separate cabin allowance into two categories: a larger cabin bag, typically stored in the overhead locker, and a smaller personal item, such as a handbag, laptop bag, or small backpack, meant to fit under the seat in front of you. The catch is that not every fare includes both. Several airlines' cheapest fare tiers strip the allowance down to a personal item only, with the full cabin bag becoming a paid add-on - which means the same airline can have a generous-sounding cabin allowance on paper that simply doesn't apply to the fare you actually booked. Turkish Airlines and ITA Airways are two examples where the personal item allowance is genuinely generous once you check the specific fare, rather than just the general policy page.
Cabin baggage allowance by airline
Figures below reflect published Economy allowances as of 2026. Some airlines vary the exact allowance by fare tier, and personal item allowances in particular are sometimes only included on standard or higher fares rather than the cheapest tier - always confirm the specific allowance shown at booking, since it can differ from the general figures below.
Lufthansa
Lufthansa's standard Economy cabin bag allowance is 55 x 40 x 23 cm, up to 8 kg, with a separate personal item of 40 x 30 x 15 cm included on Classic, Flex, and Best fares. The Basic fare strips this down to a personal item only, with the full cabin bag available as a paid add-on.
Eurowings
Eurowings allows a cabin bag of 55 x 40 x 23 cm up to 8 kg on SMART fares and above, which also include a separate personal item. The entry-level BASIC fare is more restrictive and may limit you to a personal item only.
Turkish Airlines
Turkish Airlines permits a cabin bag up to 55 x 40 x 23 cm and 8 kg, alongside a genuinely generous personal item allowance of 40 x 30 x 15 cm, up to 4 kg - one of the more generous combined allowances on this list.
Etihad Airways
Etihad's Economy cabin bag allowance is 56 x 36 x 23 cm, up to 7 kg. Economy passengers don't get a separate personal item as standard; that's reserved for Business and First, where a smaller 39 x 23 x 19 cm item is included.
ITA Airways
ITA Airways allows a cabin bag of 55 x 40 x 23 cm up to 8 kg, plus a smaller accessory item measuring 30 x 40 x 15 cm - generous enough to comfortably fit a daypack or laptop bag alongside the main cabin bag.
Loganair
Loganair has the tightest cabin bag allowance on this list, at 40 x 35 x 18 cm and 6 kg, reflecting the smaller regional aircraft common on its routes. A separate laptop bag is only included on Fly Flex+ fares.
LOT Polish Airlines
LOT's standard cabin bag allowance is 55 x 40 x 23 cm, up to 8 kg, with a smaller personal item of 40 x 35 x 12 cm permitted up to 2 kg - a lower personal item weight limit than several other airlines on this list.
Norwegian
Norwegian permits a cabin bag up to 55 x 40 x 23 cm without a firmly stated weight limit on most fares, alongside a personal item of 25 x 33 x 20 cm. The entry-level LowFare ticket restricts you to the personal item only.
Icelandair
Icelandair's cabin bag allowance is 55 x 40 x 20 cm, up to 10 kg on international routes, dropping to 6 kg on domestic and Greenland routes. A separate personal item of 40 x 30 x 15 cm is included as standard.
Soft bags versus hard cases for cabin allowance
A soft-sided bag has a genuine practical advantage when it comes to cabin sizers: it can flex slightly to fit through a borderline sizer frame in a way a rigid hard-shell case can't. This isn't a loophole so much as a margin of safety worth building in deliberately, particularly on airlines with stricter limits like Loganair's 40 x 35 x 18 cm allowance. Packing cubes inside a soft bag also make it easier to compress contents if a bag is sitting right at the edge of a size limit.
Why fare type matters as much as the airline
The biggest single reason travellers get caught out isn't picking the wrong airline - it's assuming their fare includes the full cabin allowance shown on the airline's general policy page. Several airlines on this list, including Lufthansa's Basic fare, Eurowings' BASIC tier, Etihad Airways's Economy fare, and Norwegian's LowFare ticket, restrict the cheapest booking option to a personal item only, with a full cabin bag available as a paid extra. If you've booked the lowest available fare specifically to save money, it's worth double-checking whether that saving already assumes you're travelling with a personal item alone - otherwise, adding a cabin bag at the airport can cost considerably more than it would have to add it during booking.
What actually happens if your bag is oversized
Gate agents on most airlines use a physical sizer, either at check-in or right before boarding, and a bag that doesn't fit is typically handled one of two ways: it's checked into the hold for a fee, often at a higher rate than a bag added during booking, or in busier situations, on some airlines it may be gate-checked automatically at the departure gate to keep boarding moving. Either way, the fee for sorting this out at the airport is almost always higher than adding checked or extra cabin baggage during booking, sometimes considerably so - which makes this one of the more expensive mistakes to make on an otherwise carefully planned budget trip.
How to avoid getting caught out
A handful of habits make this a non-issue rather than a gate-side scramble:
- Weigh your bag packed, not empty, using a simple luggage scale at home before you leave. Weight limits catch out more travellers than size does, since a bag can look compact while still being over the kg limit.
- Check your specific fare's allowance, not just the airline's general policy. The breakdown above reflects standard Economy allowances, but basic or saver fares on several of these airlines strip this down considerably.
- Measure your bag including wheels and handles. Airlines measure the full outer dimensions, not just the main compartment, and a bag marketed as fitting "most airlines" can still be a few centimetres over on a stricter carrier.
- Wear bulky items rather than packing them, if you're close to the weight limit. A jacket worn onto the plane doesn't count toward cabin bag weight the way the same jacket packed inside your bag does.
- Add extra baggage online in advance if you know you'll need it, rather than waiting to find out at the gate - it's reliably cheaper booked ahead than added at the airport. Icelandair, for example, prices this noticeably lower when added during booking than at check-in.
Why this matters more on a student or budget fare
A verified student fare can already be discounted by up to 70% against the standard price, which makes an unplanned gate fee for an oversized bag proportionally a much bigger hit to the overall saving than it would be on a full-price ticket. It's exactly the kind of cost that's easy to avoid with a two-minute check before you fly, but easy to miss if you're focused purely on finding the cheapest fare itself. Our guide to saving money as a student covers the wider set of costs worth checking before you travel, and it's worth treating baggage allowance as one more line item in that same checklist rather than an afterthought.
If you're planning a longer, multi-leg trip such as a gap year, this matters even more, since you're repeating the same booking decisions across several separate flights rather than just once. Our guide to gap year budgeting covers the wider planning picture, and checking cabin baggage allowance for each leg - particularly if you're switching between airlines with different rules - is worth folding into that same planning process.
Why the rules vary so much between airlines
Cabin baggage limits aren't arbitrary, even though they can feel that way when comparing two airlines side by side. Aircraft type affects overhead locker space, and smaller regional aircraft - common on shorter European routes - often have noticeably less bin capacity than a long-haul widebody, which is part of why regional carriers sometimes set tighter size limits than international ones. Low-cost carriers also frequently use stricter cabin rules deliberately, since limiting overhead bin use speeds up boarding and reduces gate delays, which matters more on an airline running fast turnarounds between short flights. LOT Polish Airlines is a good example of a carrier that enforces its stated limits fairly strictly at busy hub airports for exactly this reason. Full-service carriers on longer routes tend to have more flexibility built in, partly because slower boarding matters less when the flight itself is several hours long.
Checking this before you book, not after
Baggage allowance is easy to treat as a detail to sort out later, but it's worth checking at the same time you're comparing fares rather than after you've already paid. This matters particularly on routes departing from busy hub airports, where gate staff tend to enforce size limits more consistently simply because of higher passenger volume. Students flying from Stuttgart, Cologne or Hamburg, for example, are often connecting through larger hubs for longer trips, which makes it worth checking the cabin allowance for every leg of the journey, not just the first one. If you're planning a longer multi-country itinerary, our guide on what is a transit visa explains why baggage rules and operating airlines can matter even more during international connections.
Booking with the right allowance in mind
If baggage allowance is a deciding factor for your trip, it's worth weighing it alongside price when comparing routes, not just checking it after you've already booked. Our guide on how to find cheap flights explains how to compare total trip costs rather than headline fares, and factoring in whether a cheaper fare actually includes the cabin bag you need is a genuinely useful extra filter once you're narrowing down options.
Frequently asked questions
The takeaway
Cabin baggage rules vary enough between airlines, and even between fare types on the same airline, that assuming your usual bag will be fine is a genuine risk to an otherwise well-planned budget trip. Check the specific allowance for your booked fare before you fly, not just the airline's general policy, and a two-minute check at booking avoids a considerably more expensive one at the gate. Set up your Flyla flight deal alerts and keep both the fare and the baggage allowance in view when you compare routes.