Backpack or travel bag as a free underseater: which suits your trip?

  • 17 min reading time

Choose a backpack for free hands and lots of walking, or a travel bag with separately accessible compartments. Compare the two available styles and measure the bag when filled.

Choose a backpack if you want to keep your hands free and walk a lot while traveling. Choose a travel bag if you will mainly set it down and want to access items from separate zippered compartments. Whichever shape you choose, the packed exterior dimensions and your ticket determine whether the bag can travel free under the seat.

Start with the trip, then choose the bag

For a short city trip involving a train, stairs, and some walking at the end, a backpack is often more practical. You carry the weight on both shoulders and keep your hands free for your phone, passport, or stroller. If you are mainly traveling by car to the airport and want to set the bag down often during the journey, a compact travel bag may be more convenient.

Choosing a backpack or travel bag based on use
Situation Most logical starting point Check before departure
Lots of walking, stairs, or transfers Backpack with two adjustable shoulder straps Whether the straps are comfortable when the bag is full
Distributing clothes and small items across multiple compartments Travel bag with separate zippered compartments Whether the bag does not bulge after packing
Accessing your passport or charger on the go The bag where the correct compartment is accessible without unloading everything Whether valuables are in a lockable compartment
Traveling free under the seat The shape that stays within the limit of your ticket The full packed exterior dimensions, including protruding parts

Two available shapes in our range

The following data is current Shopify catalog data, checked on November 6, 2026. These are not our own measurements and there is no guarantee that a full bag will be allowed at every gate.

Two underseaters side by side
Feature Gray travel bag Black backpack
Stated dimensions 40 × 30 × 20 cm 45 × 32 × 15 cm
Carrying method Handles Adjustable shoulder straps and padded back panel
Layout Five zippered compartments; one with a waterproof lining according to the catalog Multiple zippered compartments and interior compartments according to the catalog
Best suited for A trip where you set the bag down often and use compartments separately A trip where you walk a lot and want to keep your hands free
Current availability 77 at Seprio Warehouse 20 at Seprio Warehouse

View the gray travel bag measuring 40 × 30 × 20 cm or the black backpack measuring 45 × 32 × 15 cm. The stock numbers are administrative availability as of November 6; they may change.

Which size route fits your booking?

The backpack is wider and taller, but shallower than the travel bag. Therefore, “the largest bag” is not a useful general choice. First check the current free underseat size of your airline and ticket in the comparison of free carry-on rules. Then measure the full bag according to the steps for a packed underseater.

The official conditions were rechecked on November 6, 2026. Ryanair, Transavia, and Wizz Air currently list 40 × 30 × 20 cm for the free small item; easyJet lists 45 × 36 × 20 cm. Weight and ticket conditions differ. The bag must actually stay within the applicable limit and fit under the seat; a product title is not a guarantee of admission.

Do this choice check at home

  1. Only prepare the items that really need to go on this trip.
  2. First pack the bag shape that fits your carrying route.
  3. Close all zippers without squeezing the bag together.
  4. Measure the length, width, and depth at the widest points.
  5. Carry the full bag briefly as you will do on the go.
  6. Check whether your passport, phone, and charger are accessible without emptying the bag.

If a soft bag becomes too thick after filling, first remove a bulky item. The guide efficiently packing an underseater helps to keep the exterior dimensions as the guiding factor.

All backpacks and travel bags per airline

View all currently available backpacks and travel bags in our range per airline that fall within the free underseat size based on their stated dimensions. Each color has its own card. A bag can therefore be listed for multiple airlines.

Always compare the three sides of the packed bag with your booking. For the size 40 × 20 × 25 cm, width and depth are in a different order than for 40 × 30 × 20 cm. Bulging compartments and protruding parts count; the packed dimensions and the conditions of your flight remain decisive.

Bags for Ryanair

Free underseat size: 40 × 30 × 20 cm. Below are all 7 suitable versions from our current range.

Bags for Transavia

Free underseat size: 40 × 30 × 20 cm. Below are all 7 suitable versions from our current range.

Bags for easyJet

Free under-seat size: 45 × 36 × 20 cm. Below are all 8 suitable options from our current range.

Assortment and sizes checked on November 6, 2026. Product sizes are from the catalog; these are not our own measurements. Price and availability are updated for each variant as soon as you open this page.

The choice in one sentence

Take the backpack for ease of carrying and free hands; take the travel bag for setting down and using compartments separately. Only choose a specific size after you have checked the current booking and always measure the packed bag.

Source check November 6, 2026: official baggage conditions of Ryanair, Transavia, easyJet and Wizz Air. Catalog dimensions and layout are not our own physical measurement or gate test.

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