Underseater – Cabin Backpack 40x30x20 with TSA Lock – Beige

Lundholm Underseater Waterproof Backpack - 15.6 inch Laptop Bag with TSA Lock

Meet the Underseater waterproof backpack from the exclusive collection by the Scandinavian brand Lundholm. This stylish, versatile backpack in elegant beige brings together Scandinavian design and hard-working functionality. Perfect for the modern traveler or professional on the move – for work, study or a flight. Thanks to the waterproof zippers and high-quality materials, your things stay dry and safe, even in an unexpected downpour. With its built-in TSA lock and smart suitcase-style layout inside, this is the ideal underseater for cabin baggage.

Benefits

This luxury backpack is designed with an eye for detail and everyday ease. Made from durable, fully waterproof material, it offers solid protection against moisture. The clever layout, inspired by a suitcase, with a padded 15.6 inch laptop compartment at the back, roomy sections and handy slip pockets, keeps everything organized. The compression straps on the sides let you cinch the bag down for a compact fit. With a security zipper for extra protection, a dedicated pocket for your water bottle and several zip pockets, this backpack is extra practical for daily use or travel. Thanks to its cabin-friendly dimensions, you take it on board without a second thought.

Specifications

• Made from high-quality, fully waterproof material
• Waterproof zippers for solid protection
• Padded laptop compartment for 15.6 inch laptops (positioned at the back)
• Smart suitcase-style layout with roomy sections and slip pockets
• Back pocket with zip closure and TSA lock for safe storage
• Compression straps on the sides to adjust the size
• Dedicated pocket for a water bottle
• Several zip pockets for organized storage
• Cabin bag approved (fits under the seat) Dimensions: 40 cm x 30 cm x 16 cm
• 22L - maximum use of space
• Color: Beige
• Scandinavian Design

Which airlines let the Underseater fly free?

At 40 x 30 x 16 cm, the Underseater fits inside the free under-the-seat allowance (40 x 30 x 20 cm) of virtually every airline – so you pay nothing extra for cabin baggage:

• Ryanair – free 40 x 30 x 20 cm (increased since 2026): fits
• Transavia – free 40 x 30 x 20 cm, max 10 kg: fits
• Wizz Air – free 40 x 30 x 20 cm: fits
• easyJet – free 45 x 36 x 20 cm: fits easily
• Eurowings – free 40 x 30 x 25 cm: fits
• TUI fly, Corendon and Vueling – free 40 x 30 x 20 cm: fits
• KLM and Lufthansa – fits as included cabin baggage or carry-on

Check the current rules per airline in our cabin baggage guide and the 2026 comparison table. Airlines can change their rules – always check your own booking.

Frequently asked questions

Does the Underseater fly as free cabin baggage?
Yes. At 40 x 30 x 16 cm it fits inside the common free under-the-seat allowance of 40 x 30 x 20 cm at Ryanair, Wizz Air, Transavia, easyJet, Eurowings, TUI fly, Corendon and Vueling, among others.

Which laptop fits inside?
At the back there is a padded compartment for a laptop up to 15.6 inch, easy to take out separately at security.

Is the backpack waterproof?
Yes, it is made from fully waterproof material with waterproof zippers, so your laptop and clothes stay dry.

What is a TSA lock?
A lock that customs can open with a universal key without forcing it – your things stay safe, even if the bag has to go in the hold for once.

How much fits inside?
22 liters, with a suitcase-style layout, laptop compartment, bottle pocket, several zip pockets and compression straps to pull the bag compact.

Lundholm - Quality Design | Scandinavian Elegance

Lundholm is a byword for high quality and timeless design. Guided by the Scandinavian values of durability, simplicity and function, Lundholm creates products that are beautiful and made to last. The Underseater collection embodies that vision with a modern, practical touch – perfect for anyone who wants style, security and easy travel in one bag.