In short: The best backpacks to travel Europe fit the strictest flight on your itinerary, not just the flight over. A pack that measures 55 x 40 x 20 cm or less works as a paid cabin bag on Ryanair and as a carry-on on US airlines, while the free under-seat bag on budget carriers is far smaller.
By Emily Carter, Travel Gear & Packing Expert · Last updated: 10/01/2026
Americans travel overseas more than ever. The National Travel and Tourism Office counted 53.8 million US residents flying to overseas destinations in 2024, up 9.8% from the year before, and the average trip lasted 15.3 nights, according to its 2024 outbound traveler report. That is roughly two weeks, which is exactly the trip length where the backpack-or-suitcase question comes up.
For Europe, a backpack usually wins. The catch is that the bag that flies easily from the US can be too big for the short hops between European cities. This guide covers how to pick one that works on every leg.
Why Is a Backpack Better Than a Suitcase for Europe?
A backpack keeps both hands free in the places where Europe is hardest on luggage:
- Stairs. Some older hotels, apartments, and train stations have long staircases and small or no elevators.
- Cobblestones. Suitcase wheels can rattle and catch on uneven old-town streets.
- Trains and buses. A backpack is easier to lift onto overhead racks and carry through narrow aisles.
- Small cars and taxis. A soft bag fits trunks a hard-shell suitcase does not.
A suitcase still makes sense if you are staying in one city with a taxi from the airport, or carrying formal clothes that must stay pressed. For moving between cities, a backpack is the easier bag to live with.
What Size Backpack Do You Need for Europe?
Capacity is limited by the airline sizer, not by how much you want to bring. A bag at Ryanair's 55 x 40 x 20 cm cabin limit is a box of 44 liters at most (55 x 40 x 20 cm = 44,000 cubic centimeters), so a "60L" bag can only fly in the cabin if it can shrink back to that size.
| Trip length | What to aim for | Why |
|---|---|---|
| Weekend | A slim daypack that fits under the seat | Budget fares include only a small under-seat bag |
| One week | A carry-on backpack within 55 x 40 x 20 cm | Fits paid cabin allowances on most European airlines |
| Two weeks | The same carry-on pack, plus laundry once | Clothes, not capacity, are what grows with trip length |
| One month or more | A carry-on pack and a plan to wash weekly | A larger pack usually has to be checked |
If you want help deciding how much clothing a two-week trip needs, our checklist of things to bring on a trip breaks it down by category.
Will Your Backpack Fit European Airline Limits?
This is where most US travelers get caught. Budget airlines in Europe sell the cabin bag separately and check it with a metal sizer at the gate.
| Airline and bag | Maximum size | Notes |
|---|---|---|
| Ryanair free small bag | 40 x 30 x 20 cm | Included on every fare; must fit under the seat |
| Ryanair Priority & 2 Cabin Bags | 55 x 40 x 20 cm, 10 kg | Paid add-on; goes in the overhead locker |
| American Airlines carry-on | 22 x 14 x 9 in (56 x 36 x 23 cm) | Typical of US carriers on the transatlantic leg |
Sources: Ryanair bag rules and American Airlines carry-on bags. Ryanair states that a small bag or cabin bag that does not fit its sizers will be refused at the gate or placed in the hold for a fee.
The practical takeaway: the free under-seat bag on budget carriers is too small for a full travel backpack. If your trip includes Ryanair or another low-cost airline, plan to buy the cabin bag add-on, and make sure your pack fits the 55 x 40 x 20 cm box when you board. Other airlines set their own sizes, so check the numbers on your booking before you fly.
How Should You Use an Expandable Backpack on European Flights?
Expandable backpacks are useful in Europe precisely because the flights are uneven: a generous allowance across the Atlantic, then tighter rules between cities.
The Aervira™ AeroPack 60L is a good example of how to work with that. According to its product specifications, it measures 19.3 x 12.5 x 6 inches (about 49 x 32 x 15 cm) in daily mode and 19.3 x 12.5 x 8 inches (about 49 x 32 x 20 cm) when expanded.
- Transatlantic flight: either mode fits within the American Airlines carry-on size above.
- Ryanair with Priority: daily mode sits comfortably inside 55 x 40 x 20 cm. Expanded, the depth is about 20.3 cm, just over the 20 cm limit, so fly in daily mode to avoid a problem at the sizer.
- Ryanair basic fare: neither mode fits the free 40 x 30 x 20 cm bag, so add the cabin bag allowance.
The way to keep the pack in daily mode without leaving clothes behind is compression. The AeroPack's sealed compression section, flattened with the pump that ships with it, takes soft layers such as sweaters, hoodies, and sleepwear. Pumping out air shrinks volume, not mass, so keep an eye on Ryanair's 10 kg cabin bag limit; the reasons are explained in whether vacuum bags reduce weight.
What Features Matter in Backpacks to Travel Europe?
- A lockable main compartment. Crowded trains and tourist sites are where bags get opened. The AeroPack has a TSA-approved combination lock.
- Clamshell or wide opening, so you can find things without unpacking on a hostel bunk or a hotel bed.
- A padded laptop sleeve, if you work while you travel.
- Water resistance for rain between the station and the hotel.
- A luggage pass-through strap, so the pack can ride on top of a rolling bag if you bring one.
- A separate wet and dry section so a damp towel or laundry stays away from clean clothes.
Is the AeroPack a Good Backpack for Europe?
It suits travelers on a one to two week trip who want one bag for a laptop and clothes, flying a full-service airline or buying the cabin bag add-on on budget carriers. Its built-in compression keeps bulky layers small enough to stay in daily mode, which matters most on the tighter European sizers.
It is not the right pick if you only ever book Ryanair's basic fare with the free under-seat bag, or if you plan long hikes with a heavy load, where a trekking pack with a full hip belt will carry more comfortably. For a broader comparison of compression backpacks, see best vacuum backpack for travel.
How Do You Pack a Backpack for Two Weeks in Europe?
- Plan one week of outfits that mix and match, and plan to do laundry once.
- Compress soft layers such as sweaters, fleece, and sleepwear, and keep structured pieces flat on top.
- Put heavy items close to your back and toward the middle of the pack, so it sits balanced on stairs and platforms.
- Keep documents and a charger in an outer pocket. A passport holder holds your passport and flight documents in one place for each leg of the trip.
- Measure and weigh the packed bag at home against the strictest flight on your itinerary.
If your trip spans seasons, our guide on how to pack winter clothes in a carry-on covers the bulky layers.
FAQ
What size backpack do I need for 2 weeks in Europe?
A carry-on backpack that fits 55 x 40 x 20 cm is enough for two weeks if you do laundry once. That size also fits the paid cabin bag allowance on Ryanair and the carry-on limit on US airlines.
Can I bring a backpack as a carry-on on Ryanair?
Yes, if it fits the sizer. A backpack up to 40 x 30 x 20 cm counts as the free small bag. A larger backpack up to 55 x 40 x 20 cm and 10 kg needs the Priority & 2 Cabin Bags add-on.
Is a 60L backpack too big for Europe?
Only if it stays at 60L when you fly. A pack that can shrink back to a carry-on size, like an expandable compression backpack in daily mode, can still go in the cabin. A fixed 60L pack usually has to be checked.
Do I need an anti-theft backpack in Europe?
A lockable main compartment and zippers that close against your back are enough for most trips. Keep your passport and cards in an inside pocket or a holder rather than an outside pocket; our guide to choosing a passport holder for travel covers what RFID lining actually protects.
Is a backpack good for studying abroad in Europe?
Yes for getting there and for weekend trips, but a semester usually needs checked luggage as well. Use the backpack as your carry-on and for travel between cities once you arrive.
In Short
- Pick a backpack that fits the strictest flight on your itinerary, usually a European budget airline
- Ryanair's free bag is 40 x 30 x 20 cm; its paid cabin bag is 55 x 40 x 20 cm and 10 kg
- A bag at 55 x 40 x 20 cm holds about 44 liters, so larger packs must shrink to fly in the cabin
- An expandable compression backpack can fly in daily mode and expand once you land
- Pack one week of outfits, compress soft layers, and weigh the bag before you leave
