Carry-On Only for European City Trips: What You Really Need
Carry-on only travel is often presented as a challenge.
How little can you bring?
How small can the bag be?
Can everything fit into one backpack?
We think there is a more useful question:
How much luggage makes the trip easier without leaving behind things you genuinely need?
For a short European city trip, travelling without checked luggage can make a noticeable difference.
You have less to carry, less to manage and less luggage between you and the city you came to visit.
But carry-on only is not automatically the right choice for every trip.
The weather, transport, accommodation, activities and baggage rules all matter.
This is how we currently decide whether a European city trip is suitable for carry-on-only travel.
If you already know you want to travel light and mainly need help deciding what to pack, start with our 3-Day European City Break Packing List.
What does carry-on only actually mean?
For City Trip Lab, carry-on only simply means:
travelling without checked luggage.
That could mean travelling with only a small personal item under the seat.
It could also mean using a personal item plus a larger cabin bag stored in the overhead compartment.
Those are quite different packing challenges.
A traveller with a small backpack may have considerably less space than someone travelling with a cabin trolley.
That is why we do not treat “carry-on only” as one fixed bag size.
The relevant question is how much cabin luggage your particular trip requires.
If you want to explore the smallest version, our Personal Item Only for a 3-Day City Trip guide looks specifically at whether one under-seat-sized bag can be enough.
Why carry-on only works particularly well for city trips
A city trip usually involves much more movement than a resort holiday.
You may travel from airport to train.
From train to metro.
From metro to hotel.
You may walk several blocks over pavements, stairs or cobbled streets.
And on the final day, you may need to carry your luggage again after checking out.
That is where the practical value of smaller luggage becomes obvious.
Every extra kilogram has to move with you.
A large suitcase may seem perfectly manageable at home.
It feels very different when you are carrying it down underground station stairs.
The biggest benefit may be mobility
Saving money on baggage fees gets a lot of attention.
But after our previous trips, we think mobility may be more important.
Less luggage can mean:
- easier airport transfers;
- easier use of buses, trains and trams;
- less effort walking to accommodation;
- simpler hotel storage;
- less concern about where to leave bags;
- faster packing when moving on;
- fewer belongings to keep track of.
During short trips, these small conveniences add up.
If you only have two or three days in a city, spending less time managing luggage has real value.
More luggage space often creates more luggage
One pattern from our previous trips has become increasingly clear.
When more space was available, we used it.
Travelling by car made it easy to bring extra clothes.
A trolley made it easy to add another pair of shoes.
Empty suitcase space made larger toiletries feel harmless.
The individual choices seemed small.
Together, they created bags containing items that never got used.
Across our reconstructed trips, unused clothing appeared every time.
A second pair of shoes was also packed on every trip and needed on none of them.
That does not prove everyone should travel with less.
But it has changed how we think about luggage capacity.
Extra capacity is not always useful capacity.
Sometimes it simply makes overpacking easier.
Start with the trip, not the suitcase
We would not recommend choosing a bag before thinking about the trip.
Start with the conditions.
Ask:
How many days are we travelling?
What will the weather realistically be?
What activities are planned?
Do we need specialist clothing?
Will we walk from public transport to the accommodation?
Can we leave luggage at the hotel on arrival and departure day?
Do we need formal clothes?
Are there children or special equipment involved?
Only then decide which luggage makes sense.
Choosing the smallest possible bag first and forcing everything into it can create a different kind of bad packing.
The aim is not minimalism for its own sake.
The aim is appropriate luggage.
Three days is very different from seven
Trip duration obviously matters, but clothing does not increase in a perfectly straight line.
A seven-day trip does not necessarily require more than twice as much luggage as a three-day trip.
Some items stay the same regardless of trip length.
You still only need one phone charger.
You still need one toiletry bag.
You may wear the same coat.
The difference mainly appears in clothing and consumables.
That is why short city trips are especially suitable for experimenting with smaller luggage.
For two or three nights, there are relatively few genuine reasons to carry a large suitcase.
Summer makes carry-on travel easier
Warm-weather clothing generally takes up less space.
T-shirts, lightweight trousers and thin layers are easier to pack than thick sweaters and winter clothing.
A summer three-day city trip may therefore fit comfortably into a bag that would be frustrating during winter.
But warm weather creates its own packing temptations.
Extra footwear, several outfit options and unnecessary “just in case” clothing can still fill a surprisingly large bag.
A smaller bag does not eliminate those decisions.
It simply makes them more visible.
Winter changes the calculation
Winter is where carry-on-only advice can become unrealistic if it is presented too simplistically.
Sweaters are bulky.
Cold weather may require gloves, scarves and additional layers.
Shoes may be larger.
And wet or freezing conditions can make a backup option more useful than during mild weather.
Fortunately, the largest winter items can often be worn during travel.
A coat does not need to occupy half the suitcase if you are already wearing it.
The same applies to heavier shoes.
That can make winter carry-on travel possible without resorting to uncomfortable packing tricks.
One good pair of shoes saves an enormous amount of space
Shoes remain one of the first places we would look when reducing luggage.
They are large, relatively heavy and difficult to compress.
Our own historical pattern is unusually consistent:
a second pair was packed on four reconstructed trips and needed on none.
That does not mean everyone should always travel with one pair.
A hiking trip, formal event or extreme weather can create a real reason for additional footwear.
But for an ordinary sightseeing-focused city trip, we now start with:
one comfortable pair of everyday shoes.
The second pair needs to justify its space.
Accommodation matters more than you might expect
Your hotel or apartment can influence what you need to bring.
Towels may already be provided.
Toiletries may be available.
A hairdryer may already be in the room.
Some accommodation has laundry facilities.
Others allow luggage storage before check-in or after check-out.
Checking those details before packing can prevent several items entering the bag at all.
It can also make carry-on-only travel easier because the accommodation provides some of what would otherwise need to travel with you.
Transport changes the value of small luggage
Carry-on-only travel matters most when you have to move the luggage yourself.
Plane
On flights, cabin baggage can reduce the need to check in luggage and wait at baggage reclaim.
But airline rules matter.
Dimensions, weight allowances and what is included in the ticket can differ substantially.
Always check the current rules directly with the operating airline.
Train
Train travel removes the airport baggage system, but large luggage can still be inconvenient.
You may need to lift it onto trains, store it in luggage areas and move quickly during connections.
A smaller bag can make European rail travel considerably easier.
Car
A car changes the incentives completely.
Space becomes less restrictive, which is convenient.
It also makes overpacking extremely easy.
Our own experience suggests that travelling by car requires more packing discipline, not less.
The boot should not become permission to bring everything that might possibly be useful.
Personal item or cabin trolley?
Once you decide to travel without checked luggage, there is still another decision.
Do you need only a personal item?
Or is a larger cabin bag worthwhile?
We think the answer should depend on how much practical benefit the extra space creates.
If everything comfortably fits into a personal item, there is little reason to carry a larger bag.
But if squeezing everything into a tiny backpack creates an uncomfortable, overfilled bag that is difficult to use, a slightly larger cabin bag may be a much better choice.
There is no prize for arriving with the smallest backpack.
Weight matters as much as size
People often focus entirely on airline dimensions.
But a bag that technically fits can still be unpleasant to carry.
This is particularly relevant with backpacks.
A compact bag can become extremely dense when clothing and electronics are compressed into a small space.
The result may satisfy a baggage sizer while being uncomfortable during a thirty-minute walk to accommodation.
That is why future City Trip Lab tests will record both dimensions and packed weight.
We want to know not only whether the bag fits.
We want to know whether travelling with it is pleasant.
Packing cubes do not create a carry-on strategy
Organisation products can help once you know what you are bringing.
They should not determine how much you bring.
Our Packing Cubes vs Compression Packing Cubes guide explains why fitting more clothing into the same space is not necessarily the same as packing better.
Our preferred sequence is:
Choose what you need.
Remove what you probably will not use.
Then organise what remains.
Not the other way around.
Toiletries are an easy category to reduce
Toiletries are another category where habit can create unnecessary volume.
Our own progression has already moved from full-size products to smaller versions and then to refillable travel containers.
For a short trip, the important question is not:
“How big is my normal bottle?”
It is:
“How much of this product will I actually use in three days?”
That shift alone can free a surprising amount of bag space.
Future comparisons of containers and other travel products will be added to Packing Gear.
Technology can quietly make bags heavy
Electronics are compact but dense.
A laptop, tablet, camera, power bank and multiple chargers can add considerable weight without making the bag look particularly full.
For most leisure city trips, our own useful technology has mainly been:
phone, charger and sometimes a power bank.
That will not apply to everyone.
Someone working during the trip may genuinely need a laptop.
Someone interested in photography may value a separate camera.
The principle remains the same:
technology needs a purpose too.
What we would pack for a normal three-day carry-on trip
For an ordinary three-day European city break, our starting point would currently look something like:
- comfortable shoes worn during travel;
- trousers worn during travel;
- one additional bottom if useful;
- around three tops;
- one mid-layer;
- underwear and socks;
- sleepwear if required;
- appropriate outer layer;
- compact toiletries;
- phone and charging equipment;
- essential medication;
- travel documents;
- only genuinely necessary trip-specific items.
That is a starting framework, not a universal list.
Weather and activities can change it considerably.
When checked luggage actually makes sense
Carry-on only should not become a rule that makes travel harder.
Checked luggage may be sensible when:
you need specialist equipment;
you are travelling for significantly longer;
you need several types of footwear;
you are attending formal events;
you need bulky winter clothing;
you are travelling with children;
or there are personal or medical reasons for carrying additional items.
A larger suitcase is not a packing failure.
Unnecessary luggage is the problem, not luggage itself.
The question we want to answer
City Trip Lab is gradually moving from reconstructed travel experience toward measured travel experiments.
Through the Packing Lab, we want to compare bag dimensions, empty weight, packed weight, clothing used, clothing unused, weather conditions and anything we wished we had brought.
That should eventually allow us to answer questions such as:
How much does a realistic three-day bag weigh?
Does a 20L backpack actually work?
Does travelling with less luggage improve mobility enough to notice?
Does smaller luggage reduce unused clothing?
And when does carry-on only stop being practical?
Those answers will be much more useful than simply declaring that everyone should travel light.
Our current approach
For short European city trips, carry-on only is becoming our default starting point.
Not because checked luggage is inherently bad.
And not because travelling with the smallest possible bag is impressive.
It is because previous trips repeatedly showed that we carried things we did not use.
Smaller luggage creates a reason to make those decisions before leaving home.
Our current rule is therefore simple:
Take enough luggage for the trip you are actually going on — not for every trip that could theoretically happen.
FAQ
Is carry-on only enough for a three-day city trip?
For many three-day city trips, yes. Weather, activities and personal needs can increase the amount of luggage required, but short sightseeing trips are generally well suited to smaller bags.
What is the difference between carry-on only and personal-item only?
Carry-on only means travelling without checked luggage. It can include both a personal item and a larger cabin bag. Personal-item only means travelling with only the smaller bag intended to fit under the seat.
Is a backpack or trolley better for a European city trip?
Neither is universally better. Backpacks can be easier on stairs and uneven streets, while trolleys remove weight from your shoulders. Bag weight, terrain and personal comfort matter.
Is checked luggage unnecessary for city trips?
No. Longer travel, specialist equipment, winter clothing, formal events or personal requirements can make checked luggage entirely reasonable.
Does carry-on only save money?
It can, depending on the airline and fare. However, baggage rules and prices change, so the current conditions should always be checked directly with the airline before booking.
How do I avoid overpacking a carry-on?
Start with the activities and weather, choose versatile clothing, question backup items and remove unnecessary second versions of things before trying to compress everything into the bag.
