The cabin backpack is the savvy traveller's promise: carry everything without checking in luggage, keep your hands free, and head straight out of the plane without waiting at the carousel. But choosing the right one is crucial. With airline-imposed dimensions, useful volume, and carrying comfort, a poor choice can cost you dearly — literally, with an extra fee at the boarding counter.
In short: the right cabin backpack is around 30 to 40 litres, fits your airline's size requirements, and is comfortable to carry when full. We detail everything — dimensions by airline, key 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 sizes, the large volume for longer stays, and the connected model with a 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 spare 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. Allowed dimensions vary from one airline to another, but some sizes are common:
- Standard size — 55 × 40 × 20 cm. Accepted by most traditional airlines (Air France, Lufthansa…). The safe bet for a short stay.
- Strict low-cost size — 40 × 20 × 25 cm. This is the size of the free small bag that fits under the seat on Ryanair. Compact, but free.
- Under-seat size — 45 × 36 × 20 cm. EasyJet's free under-seat luggage. A bit more generous than Ryanair.
- Max cabin size — up to 55 × 40 × 23 cm. Often reserved for the priority option (paid), it allows you to carry a week's worth of business.
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 as well as the official cabin luggage rules: it's the only way to be sure to pass without fees. When in doubt, a size close to 40 × 20 × 25 cm fits almost everywhere as free luggage.
How to Choose: The Criteria That Matter
At the same size, five criteria separate a good cabin backpack from a regrettable model. We review them, then summarise them in a cabin size chart.
- Useful volume (litres). 30 L for a light weekend, 40 L for a well-organised week. Beyond that, you often exceed cabin size.
- 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 at the pace of holds and pavements.
- Security. Hidden or lockable zippers, back pocket for documents: useful in crowded transport.
To quickly compare large cabin sizes and know which one suits your airline, here is the summary:
| Format | 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 is not 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 useful capacity of your backpack: rolling clothes instead of folding them, and compressing bulky items. A compression bag sucks the air out of jumpers and jackets, freeing up precious space — exactly what you need 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 fit in the cabin; the choice depends on your trip. The backpack wins on mobility, low-cost flights, and versatility. The cabin suitcase has the advantage of protecting rigid items and comfort on smooth surfaces (airport, hotel). For a city trip, a Ryanair flight, or a multi-stop 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 the dimensions.
Does a 40 × 20 × 25 cm backpack fit on Ryanair? Yes: it's the size of the free small bag that fits under the seat. Beyond that, you need the priority option (paid) for a larger cabin bag.
What are the dimensions for EasyJet? The free under-seat bag is around 45 × 36 × 20 cm. A compact backpack fits easily.
Cabin backpack or suitcase for light travel? For mobility and low-cost flights, the backpack. Roll your clothes and compress volumes: at the same size, you'll carry as much as with a small suitcase, with the added bonus of free hands.
