The cabin backpack is the promise of the savvy traveller: take 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 cabin travel backpack is crucial. With airline-imposed dimensions, usable volume, and carrying comfort, a poor choice can cost you — literally, with a surcharge at the boarding counter.
To cut to the chase: 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, important criteria, comparison — but first, here are the three models we recommend.
Our Selection
Three backpacks designed for cabin use, one for each need: the versatile one that adjusts to most sizes, 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 the 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.
- Saving on low-cost flights. A backpack of the right size fits as free luggage under the seat — avoiding the baggage surcharge, 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 smooth boarding and a fee to pay. 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 trip.
- 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 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 take a week's worth of business.
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 and the Irish hand baggage rules: it's the only way to be sure to pass without fees. If in doubt, a size 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 model you'll regret. We review them, then summarise them in a cabin size 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 pavements.
- Security. Hidden or lockable zippers, back pocket for papers: useful in crowded transport.
To quickly compare large cabin sizes and know which one suits your airline, here's the summary:
| Format | 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 (free small bag under the seat) | 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 jumpers 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: pack 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 jumpers, towels: anything that traps air compresses. Two precautions though — avoid vacuum-packing shirts and materials that crease, and remember that the weight doesn't change: a well-packed "vacuum" bag quickly reaches the 7 to 10 kg limit imposed by airlines.
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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 in 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 a big week — 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 business without exceeding the max cabin size. For travelling by plane 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 surcharge — it's less about the "best bag" than about centimetres in the right place.
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 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 there without difficulty.
Cabin backpack or suitcase for light travel? 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 travelling by plane? 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 size (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 for jumpers, down jackets, and towels, and keep the rest in standard packing cubes.
