The Expandable Cabin Backpack 40x30x15 Sogaïa™ is designed for the free personal object ofAir France and of KLM : 40 x 30 x 15 cm, it fits under the seat in front of you at no extra cost.
Its extension closure makes it go from 15 to 25 cm thick once arrived: you leave light, and you have room to bring back your purchases.
Why choose this 40x30x15 backpack?
- Air France and KLM format : 40 x 30 x 15 cm, the maximum dimensions of the personal object under the seat
- Expandable : 15 to 25 cm thick, i.e. approximately 18 L in the compact version and up to 30 L in the extended version
- Grand opening to quickly pack and unpack the bag
- Waterproof Oxford fabric and polyester lining
- Adjustable padded shoulder straps and abdominal belt
- Back strap to put it on the handle of a suitcase
- USB port to charge your phone with an external battery (not included) slipped inside
Features
| Dimensions | 40x30x15cm; 40 x 30 x 25 cm in extended version |
| Capacity | approximately 18 L, up to 30 L extended (maximum format volume) |
| Material | waterproof Oxford fabric, polyester lining |
| Portage | padded shoulder straps, hip belt, suitcase strap |
| Equipment | zipped extension, USB port |
| Colors | Grey, Light grey, Blue, Black |
Ideal for
- The flights Air France and KLM where only the object under the seat is free
- A weekend or a 2-3 day business trip
- A second bag next to your cabin baggage
Airlines that accept this bag in the cabin
In version compact (40 x 30 x 15 cm) :
| Airline | Free baggage | This bag |
|---|
| Ryanair | 40 x 30 x 20 cm, under the seat | ✅ Accepted free of charge |
| Vueling | 40 x 30 x 20 cm, under the seat | ✅ Accepted free of charge |
| Transavia | 40 x 30 x 20 cm, under the seat | ✅ Accepted free of charge |
| Wizz Air | 40 x 30 x 20 cm, under the seat | ✅ Accepted free of charge |
| Volotea | 40 x 30 x 20 cm, under the seat | ✅ Accepted free of charge |
| easyJet | 45 x 36 x 20 cm, under the seat | ✅ Accepted free of charge |
| Air France | 40 x 30 x 15 cm under the seat; cabin baggage measuring 55 x 35 x 25 cm depending on your price | ✅ Accepted free of charge (exact dimensions) |
| KLM | 40 x 30 x 15 cm under the seat; cabin baggage measuring 55 x 35 x 25 cm depending on your price | ✅ Accepted free of charge (exact dimensions) |
| Lufthansa | 40 x 30 x 10 cm under the seat; cabin baggage measuring 55 x 40 x 23 cm depending on your price | ❌ Too big for the free item; passes as cabin baggage if your ticket includes it |
| Royal Air Morocco | 40 x 30 x 15 cm under the seat, plus cabin luggage of 55 x 40 x 25 cm included | ✅ Accepted free of charge (exact dimensions) |
| Tunisair | 40 x 30 x 20 cm under the seat, plus cabin luggage measuring 55 x 40 x 20 cm (8 kg) included | ✅ Accepted free of charge |
| Air Algeria | A single piece of luggage, accessories included: 55 x 35 x 25 cm (10 kg), or 40 x 30 x 20 cm (5 kg) on ATR flights | ✅ Accepted as cabin baggage included |
⚠️ In the extended version (25 cm), the bag exceeds the free item: use the extension only if it travels as cabin baggage included in your ticket, or on return in the hold. Dimensions checked in October 2026: the rules change, always check the conditions of your ticket on the company's website.
Frequently asked questions
Does this bag go free with Air France?
Yes, in a compact version. Air France accepts a personal item measuring 40 x 30 x 15 cm maximum under the seat in front of you: that is exactly the size of this bag.
Can we travel with the bag in the extended version?
Not as a free item, because it is then 25 cm thick. On the other hand, at 40 x 30 x 25 cm, it respects the Air France cabin baggage of 55 x 35 x 25 cm, if your ticket includes it.
Is it accepted at Lufthansa?
Not as a free item: Lufthansa limits personal items to 10 cm thick. However, it passes as cabin baggage (55 x 40 x 23 cm) if your price includes it.
Will the new European rules change anything?
In June 2026, the European Parliament and member states reached a provisional agreement: a personal item under the seat and a small cabin bag of 7 kg would be included in the standard fare. These rules will not apply until the end of 2027 at the earliest; until then, it's the dimensions in the table above that matter.
See all our bags and luggage 40x30x15 and our cabin baggage size guide by company.
Sogaïa, French specialist in toiletry bags, vanity cases and cabin bags.
