The cabin backpack is the savvy traveller's promise: carry everything without checking in luggage, keep your hands free, and breeze through the airport without waiting at the carousel. But choosing the right one is crucial. With airline-imposed dimensions, usable volume, and carrying comfort, a poor choice can cost you — literally, with an extra fee at the boarding counter.
To cut to the chase: the right cabin backpack is around 30 to 40 litres, fits your airline's format, and is comfortable to carry when full. We detail everything — dimensions by airline, important criteria, comparison — but first, here are the three models we recommend.
Our Selection
Three backpacks designed for cabin use, each for a different purpose: the versatile one that adjusts to most formats, the large volume for longer stays, and the connected model with USB port for tech-savvy travellers. You can also browse our entire collection of cabin backpacks to compare capacities.
Why Choose a Cabin Backpack
Compared to a cabin suitcase, the backpack ticks boxes that a trolley does not. Three reasons are often cited by regular travellers:
- Hands-free and mobility. Stairs, metro, cobbled streets, tight connections: a backpack doesn't drag or get stuck on a pavement.
- Savings on low-cost flights. A backpack of the right size fits as free luggage under the seat — avoiding the baggage fee, often more expensive than the ticket itself.
- Versatility. A good cabin backpack also serves as a hiking bag, sports bag, or extra luggage for the rest of the year. A cabin suitcase does not.
The downside? A backpack offers less protection for fragile items than a hard shell and is less comfortable when very heavy. For cabin use — clothes, electronics, wash bag — it's rarely an issue.
Cabin Dimensions to Know
This is THE point that makes the difference between a smooth boarding and an extra fee. The allowed dimensions vary from one airline to another, but a few formats are common:
- Standard format — 55 × 40 × 20 cm. Accepted by most traditional airlines (Air France, Lufthansa…). The safe bet for a short trip.
- Strict low-cost format — 40 × 20 × 25 cm. This is the size of the free small bag that fits under the seat with Ryanair. Compact, but free.
- Under-seat format — 45 × 36 × 20 cm. EasyJet's free under-seat luggage. A bit more generous than Ryanair.
- Maxi cabin format — up to 55 × 40 × 23 cm. Often reserved for the priority option (paid), it allows you to carry a week's worth of items.
These rules change regularly, and each carrier has its own size and weight limits. Before you leave, always check the dimensions allowed by your carrier and CASA's official guidance on packing your bags: it's the only way to be sure to pass without fees. When in doubt, a format close to 40 × 20 × 25 cm fits almost everywhere as free luggage.
How to Choose: The Criteria That Matter
At equal format, five criteria separate a good cabin backpack from a regrettable model. We review them, then summarise them in a cabin format table.
- Usable volume (litres). 30 L for a light weekend, 40 L for a well-organised week. Beyond that, you often exceed cabin format.
- Carrying comfort. Padded straps, ventilated back, waist strap on larger models: this makes all the difference when the bag is full.
- Internal organisation. Suitcase-style opening (flat, 180°), laptop compartment, separate pockets: find your belongings without emptying everything.
- Materials. A waterproof or water-repellent fabric, sturdy zippers, and reinforced seams — the bag lives to the rhythm of holds and pavements.
- Security. Hidden or lockable zippers, back pocket for papers: useful in crowded transport.
To quickly compare large cabin formats and know which one suits your airline, here's the summary:
| Size | Dimensions | Airlines | Ideal for |
|---|---|---|---|
| Standard | 55 × 40 × 20 cm | Most airlines | The standard, short stay |
| Strict low-cost | 40 × 20 × 25 cm | Ryanair (small free under-seat bag) | Travel without baggage fees |
| Under the seat | 45 × 36 × 20 cm | EasyJet (free baggage) | Light weekend |
| Maxi cabin | 55 × 40 × 23 cm | Priority / paid cabin | A week in cabin |
A good bag isn't everything: how you pack it matters just as much. A packing cube transforms a large compartment into well-organised drawers, saving you a lot of time upon arrival. It's the most useful complement to a cabin backpack.
Optimising Space in the Cabin
With volume limited by dimensions, every litre counts. Two habits double the usable capacity of your backpack: rolling clothes instead of folding them, and compressing bulky items. A compression bag sucks the air out of sweaters and jackets, freeing up precious space — exactly what's needed when you refuse to check in luggage. Our guide to preparing your travel bag details the method.
Travel Clothes Compression Bag
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Cabin Backpack or Cabin Suitcase?
Both are cabin-friendly; the choice depends on your trip. The backpack wins on mobility, low-cost flights, and versatility. The cabin suitcase has the edge on protecting rigid items and comfort on smooth surfaces (airport, hotel). For a city trip, a Ryanair flight, or a multi-leg journey, the backpack prevails. For a business trip with a laptop and suit, the question arises. If you're still unsure about the ideal model, our broader guide to choosing a travel backpack complements this comparison.
Frequently Asked Questions
What is the maximum weight for a cabin backpack? It depends on the airline: usually 7 to 10 kg for a standard cabin bag, sometimes with no stated limit for the small under-seat bag. Always check your carrier's weight limit, in addition to dimensions.
Does a 40 × 20 × 25 cm backpack fit with Ryanair? Yes: it's the size of the free small bag that fits under the seat. Beyond that, the priority option (paid) is needed for a larger cabin bag.
What are the dimensions with EasyJet? The free under-seat bag is around 45 × 36 × 20 cm. A compact backpack fits easily within this size.
Backpack or cabin suitcase for light travel? For mobility and low-cost flights, the backpack. Roll your clothes and compress volumes: at equal format, you'll carry as much as with a small suitcase, with the added bonus of free hands.
