Travel smarter with an underseater suitcase that fits under the airplane seat and is often allowed 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 maneuverable wheeled suitcases — durable, lightweight and designed for stress-free boarding. Browse our collection and depart worry-free. Want more options beyond underseaters? Check our handbagage koffers.

What is an underseater suitcase?

An underseater suitcase is a compact cabin bag that fits under the seat in front of you. The big advantage: you keep important items within reach and avoid hassle with the overhead bins. Many airlines use 40x30x20 cm as a guideline for an underseat item, which often means it can travel without an extra fee. Ideal for a city trip or short business trip: pack your laptop, documents, toiletries and a change of clothes. Note that handles and wheels count toward the total dimensions and always check your airline's current hand luggage rules before you travel.

Sizes and rules per airline

Underseater dimensions vary by airline and can change. As a safe choice, 40x30x20 cm is the standard many carriers use. Check the current rules before departure and account for total dimensions including wheels and handles.

• Ryanair: small cabin bag under the seat - often around 40x30x20 cm. Priority is usually required for additional cabin baggage.
• Transavia: underseat item must fit under the seat. Check current maximum dimensions on Transavia's website.
• Wizz Air, Vueling, TUI, Corendon: similar underseat policies, but conditions and sizes may vary by fare type.

Tip: choose a model with smart organization and a sturdy yet lightweight construction. That way you use every centimeter without adding weight. For neat packing, packing cubes are ideal.

Which underseater suits you?

Do you prefer maximum maneuverability or ultimate flexibility? This helps decide between a bag and a wheeled suitcase.

• Bag 40x30x20 - flexible, lightweight and efficient to pack. Fits easily under seats with limited height and is handy in narrow aisles.
• Underseater suitcase with wheels - rolls smoothly through terminals, keeps its shape and better protects your contents while traveling.

Prefer a soft option with maximum flexibility? Discover our handbagage reistassen.

Material preference? Hard shells offer extra protection, while soft bags are more flexible and easier to fit into tight spaces. If you mainly want comfortable rolling through terminals, consider reistassen met wielen or a backpack with wheels as an under-seat alternative.

Popular choices from our range:

• ByMetz 40x30x20 Classic Handbagage Bag - front and back zip pockets, two side pockets, reinforced base, smart sleeve for trolleys, removable shoulder strap and sturdy handles. Made from 600D polyester with metal fittings.
• Travelite 40x30x20 Jetpack Easy 2 Wheels Underseater - two robust wheels, integrated combination lock, adjustable packing straps, divider and ergonomic handle. Official Travelite dealer for full warranty and service.

When choosing, consider weight, layout, laptop pocket, smart sleeve and lock. If you travel frequently with different airlines, an exact 40x30x20 model is the safest choice. Additionally, find useful suitcase and travel accessories such as locks and organizers.

Frequently asked questions about underseaters

What are the dimensions of an underseater suitcase?

The most commonly used size is 40x30x20 cm, because it fits under the seat and is allowed by many airlines without an extra fee. Always check the current rules per airline and fare type.

What is the best underseater?

The best underseater fits your travel style. If you want 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 underseater size on Transavia?

Transavia requires that your underseat item fits under the seat. Guideline dimensions are often around 40x30x20 cm, but always check Transavia's latest hand luggage rules before departure.

Can you take an underseater in addition to hand luggage?

With many airlines you can take an underseater as your free personal item. For additional cabin baggage in the overhead compartment an upgrade or Priority is usually required. Consult your airline for details.

Why ByMetz

• Specialist in underseater and hand luggage solutions since 1974
• Free shipping from €29 to NL and BE
• Insured shipping via PostNL Express
• 14-day return period and pay later with Klarna
• Personal advice via WhatsApp and pickup in Eindhoven

Ready to fly worry-free? Choose your underseater suitcase 40x30x20 and travel without surprises at the gate.