What is the ideal volume for a carry-on backpack?
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The ideal volume for a carry-on backpack intended for the overhead bin is between 35 and 45 liters, depending on the length of the trip and the dimensions allowed by the airline. Below 30 liters, the capacity is generally too limited for a stay of more than one to two days. The goal is therefore to maximize useful volume while remaining compliant with carry-on size limits, most often close to 55 × 40 × 20 cm, with variations depending on the airlines.
Volume and dimensions: how to choose the right carry-on backpack?
- 30 to 35 liters: suitable for a short stay of one to three days or for a very minimalist trip. The format is safe and easily fits in the cabin, but the capacity remains limited.
- 35 to 40 liters: excellent compromise for two to four days. This volume is compatible with the majority of standard carry-on sizes and allows you to travel light without checked baggage.
- 40 to 45 liters: maximum recommended volume for a carry-on backpack placed in the overhead bin, at no extra cost. Ideal for three to five days, provided you respect a depth of 20 to 23 cm and opt for a well-structured and compressible bag.
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FAQ about carry-on backpack volume
Is a 40L backpack allowed in the cabin?
Yes, in most cases, provided its external dimensions comply with the limits imposed by the airline (for example 55 × 40 × 20 cm or 45 × 36 × 20 cm). Volume in liters is only an indicator: the bag's shape, its rigidity, and its ability to be compressed play a decisive role.
Is a 20L bag enough for a weekend?
Yes, for a very minimalist trip or a short duration. However, for more comfort and flexibility, a 30 to 35L carry-on backpack is generally more suitable, especially if you are carrying shoes, a toiletry bag, or a laptop.
What is the difference between liters and dimensions?
Liters correspond to the internal volume, while dimensions indicate the external bulk of the bag. A poorly designed or overly thick 40L bag may be refused in the cabin if it exceeds the authorized dimensions, even if its volume seems reasonable on paper.
Is the volume checked at the airport?
No. Airlines do not measure volume in liters. Only the physical dimensions of the bag are verified, most often using a metal sizer. Hence the importance of choosing a well-calibrated bag rather than relying solely on the advertised figure.
What volume should I choose to avoid extra fees?
To travel peacefully without surcharges, opt for a 35 to 40L backpack, with compliant dimensions and good compressibility. It is currently the best compromise between capacity, comfort, and cabin compliance.
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