Travel smarter with an underseater suitcase that fits under the plane seat and can often fly with you for free. At ByMetz you'll find compact 40x30x20 cabin bags and underseat suitcases that meet the rules of Ryanair, Transavia, TUI, Vueling, Wizz Air and Corendon. Choose from practical bags and easy-to-steer suitcases with wheels: durable, lightweight and designed for stress-free boarding. Browse our collection and set off without worries. Looking for more options beyond underseaters? Take a look at our carry-on suitcases.
What is a 40x30x20 underseat suitcase?
An underseater suitcase is a compact cabin bag that fits under the seat in front of you. The big advantage: you keep important things within reach and you avoid the hassle with overhead bins. Many airlines use 40x30x20 cm as a guideline for an underseat item, so in most cases this bag can travel with you without a surcharge. Ideal for a city break or a short business trip, because you pack exactly what you need: laptop, documents, toiletries and a change of clothes. Make sure handles and wheels fall within the total dimensions, and always check your airline's current cabin baggage rules before you leave.
40x30x20 suitcase: dimensions and rules by airline
Underseater dimensions differ per airline and sometimes change. As a safe choice, 40x30x20 cm is the standard many airlines work with. Check the current rules before you leave and take the total dimensions into account, including wheels and handle.
- Ryanair: small cabin bag under the seat of 40 × 30 × 20 cm. For extra cabin baggage, Priority is usually required.
- Transavia: under-seat item with maximum dimensions of 40 × 30 × 20 cm.
- Wizz Air, Vueling, TUI and Corendon: also 40 × 30 × 20 cm. At Corendon, the small bag may weigh no more than 3 kg.
From 23 October 2027, a minimum applies across the entire EU: a bag of 40 × 30 × 15 cm may then fly free of charge with every airline. Read more about the new EU rules for cabin baggage.
Tip: choose a model with smart organisation and a sturdy but light construction. That way you use every centimetre without adding weight. For tidy packing, packing cubes are ideal.
Which 40x30x20 underseater suits you?
Do you go for maximum manoeuvrability or ultimate flexibility? This helps you decide between a bag and a suitcase with wheels.
- 40x30x20 bag: flexible, light and efficient to pack. Fits easily under seats with limited height and is handy in narrow aisles. The best choice in this size.
- Underseater suitcase with wheels: rolls smoothly through terminals, keeps its shape and protects your belongings better while travelling.
Prefer a soft option with maximum flexibility? Explore our carry-on travel bags.
Do you have a material preference? Hard suitcases offer extra protection, while soft suitcases are a little more flexible in shape and fit more easily into small spaces. If you mainly want to roll comfortably through terminals, consider travel bags with wheels or a backpack with wheels as an under-seat alternative.
Popular choices from our range:
- ByMetz 40x30x20 Classic Cabin Bag: front and back pockets with zip, two side pockets, reinforced base, smart sleeve for your trolley, detachable shoulder strap and sturdy handles. Made of 600D polyester with metal fittings.
- Travelite 40x30x20 Jetpack Easy 2 Wheels Underseater: two robust wheels, integrated combination lock, adjustable packing straps, divider and ergonomic carry handle. Official Travelite dealer for full warranty and service.
When choosing, pay attention to weight, layout, laptop compartment, smart sleeve and lock. If you often fly with different airlines, an exact 40x30x20 model is the safest choice. You'll also find handy luggage and travel accessories such as locks and organisers.
Frequently asked questions about 40x30x20 underseaters
What size is an underseater suitcase?
The most common size is 40x30x20 cm, because it fits under the seat and many airlines let you take it on board without a surcharge. Always check the current rules per airline and ticket type.
What is the best underseater?
The best underseater suits your travel style. If you want to travel light and flexible, choose a 40x30x20 bag. If you want more protection and rolling comfort, choose an underseater suitcase with wheels and a combination lock.
What is the maximum size of an underseater at Transavia?
Transavia requires your underseat item to fit under the seat. Guideline dimensions are often around 40x30x20 cm, but always check the latest cabin baggage conditions at Transavia before you leave.
Can you take an underseater in addition to cabin baggage?
Many airlines let you take an underseater as your free personal item. For extra cabin baggage in the overhead locker, an upgrade or Priority may be required. Check with your airline for details.
Why ByMetz
- Specialist in bags and suitcases since 1974
- 30 days return policy
- Official dealer with full warranty
- Pay later with Klarna at no extra cost
- Personal advice via info@bymetz.nl
Ready to fly without worries? Choose your 40x30x20 underseater suitcase and travel without surprises at the gate.