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 cabin travel backpack is crucial. Between the dimensions imposed by airlines, usable volume, and carrying comfort, a poor choice can cost you — literally, with an extra fee at the boarding counter.
To keep it simple: 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, a backpack ticks boxes that a trolley doesn't. Three reasons are often cited by regular travellers:
- Hands-free and mobility. Stairs, subways, cobblestone streets, tight connections: a backpack doesn't drag or get stuck on a curb.
- 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 throughout 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 on 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 belongings.
These rules change regularly, and each carrier has its own size and weight limits. Before you travel, always check the dimensions allowed by your carrier as well as the official cabin baggage rules: it's the only way to be sure to pass without extra 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 size, 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 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 to the rhythm of holds and sidewalks.
- 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 go-to for short stays |
| 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 luggage) | Light weekend |
| Maxi cabin | 55 × 40 × 23 cm | Priority / paid cabin | A week in the 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.
52,90 $ CAD
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Optimising Space in the Cabin
With volume limited by dimensions, every litre counts. Two habits double the usable capacity of your backpack: roll clothes instead of folding them, and compress 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.
The most radical version is the vacuum cabin bag: store textiles in an airtight cover, expel the air by rolling or with a pump, and the volume shrinks by a third to half. Down jackets, winter sweaters, towels: anything that traps air compresses. Two precautions though — avoid vacuum-packing shirts and materials that crease, and remember that weight doesn't change: a well-packed "vacuum" bag quickly reaches the 7 to 10 kg limit imposed by airlines.
Travel Clothing Compression Bag
26,90 $ CAD
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Cabin Backpack or Cabin Suitcase?
Both are allowed in the cabin; the choice depends on your trip. The backpack wins on mobility, low-cost flights, and versatility. The cabin suitcase holds the advantage for 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.
What is the Best Cabin Backpack? Our Verdict
After thousands of flights completed by our travellers, three profiles stand out clearly. The best versatile choice remains the expandable backpack: its adjustable volume from 37 to 45 litres fits most airline sizes, from short trips to long weeks — it's the one we recommend if you only buy one. For long stays in the cabin, the large volume takes the lead as soon as you optimise packing: suitcase-style opening, reinforced carrying, it swallows a week's worth of belongings without exceeding the maxi cabin size. For flying with electronics, the model with integrated USB port keeps the phone charged during layovers, and its laptop compartment passes security checks without unpacking everything.
And if your criterion is neither volume nor connectivity but free luggage on low-cost flights: aim for the size first. A bag in the 40 × 20 × 25 cm format that fits under the seat will save you any extra fees — it's less about the "best bag" and more about centimetres in the right place.
Frequently Asked Questions
What is the maximum weight for a cabin backpack? It depends on the airline: usually from 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 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 luggage is around 45 × 36 × 20 cm. A compact backpack fits there easily.
Backpack or cabin suitcase for travelling light? For mobility and low-cost flights, the backpack. Roll your clothes and compress volumes: at equal size, you'll carry as much as with a small suitcase, with the added bonus of free hands.
What is the best backpack for flying? The one that fits YOUR airline's size first and foremost. Then, a versatile expandable model covers the most situations; on low-cost flights, an under-seat format (40 × 20 × 25 cm) travels for free; and for trips with a laptop, choose a dedicated compartment that opens flat at security checks.
Is the "vacuum cabin bag" worth it? Yes for bulky textiles: airtight cover + expelled air = a third to half less volume. But the weight remains the same, and creases mark shirts — reserve vacuum-packing for sweaters, down jackets, and towels, and keep the rest in standard packing cubes.
