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Ryanair cabin bag 40 x 20 x 25 cm: how to choose an under-seat bag without any nasty surprises

A Ryanair cabin bag 40 x 20 x 25 cm must meet very specific dimensions to fit under the seat without extra charges, when your booking only includes a personal item. In practice, product descriptions and photos aren’t always enough to make the right choice.

A bag described as “airline-compatible” can quickly become problematic if it’s too rigid, overstuffed, or even slightly larger than the permitted dimensions. So if you’re travelling from the UK with a Ryanair travel bag, it’s best to check its actual measurements, its empty weight, and how it’s carried.

Common pitfalls before you buy

1. Confusing external dimensions with stated capacity

A capacity of 20 L doesn’t guarantee the bag meets the airline’s size requirements. Two models with the same volume can have very different shapes. A soft bag measuring 40 × 20 × 25 cm will sometimes slide under a seat more easily than a rigid model with sharp corners, but it mustn’t be stuffed to the point of distorting.

Before ordering, always check the measurements in the order length × width × height. Also consider handles, wheels and external pockets, which can increase the overall size.

2. Overlooking the empty weight

The heavier your personal item is when empty, the less room you have for your belongings. For a short trip, a lightweight cabin bag weighing under 500 g lets you pack more clothes, documents and electronics without weighing yourself down unnecessarily.

Product listings can show different weights depending on the colour or version. Always refer to the listing for the specific model you’ve chosen, rather than just the title.

3. Overestimating water resistance

“Waterproof”, “water-repellent” and “water-resistant” don’t offer the same level of protection. A truly waterproof bag generally needs a sealed construction. Water-resistant Oxford or nylon fabric mainly protects against splashes and light rain.

For everyday travel in the UK, this protection can be very handy. However, it doesn’t replace using a waterproof cover or pouch for a laptop, passport or other electronics.

The criteria to check for a low-cost airline personal item

Dimensions that fit under the seat

Ryanair sets specific dimensions for the included personal item, depending on the conditions of your booking. The products in this selection are listed at around 40 × 20 × 25 cm, while some more compact models measure 35 × 20 × 20 cm. Check the rules for your ticket before you travel: allowances and dimensions can change.

A bag that meets Ryanair’s dimensions should be able to go under the seat without being forced. Avoid filling a bulky external pocket to the brim, and always measure the bag once it’s packed.

A genuinely usable capacity

A 20 L cabin handbag can usually hold a few lightweight clothes, a toiletries bag, documents and several accessories for a short trip. A 14 L model focuses more on compactness and quick access, while a 23 L or larger bag offers more versatility for sport or a weekend away, but won’t automatically be compatible with the under-seat format.

The internal shape also matters. A wide opening makes packing easier, while several small pockets keep frequently used items within easy reach.

Carrying and organisation

For connections and journeys on public transport, a cabin bag with a shoulder strap is generally more practical than a model you can only carry by hand. A back strap that lets you attach the bag to a suitcase handle can also add comfort in airports.

Look for at least:

  • a reliable zip fastening;
  • an external pocket for tickets and documents;
  • an adjustable or removable shoulder strap;
  • handles that can be joined with a Velcro fastening;
  • an easy-to-clean fabric.

Our selection by profile

Recommended for: Budget-conscious beginners
Kono 35 x 20 x 20 cm cabin bag for Ryanair, pink

Kono 35 x 20 x 20 cm cabin bag for Ryanair, pink

Why this choice suits this profile: Its compact dimensions are ideal for travellers who pack light and want an easy-to-carry duffel bag for a short trip.

How this product avoids the pitfall

The stated size of 35 × 20 × 20 cm leaves some margin compared to the 40 × 20 × 25 cm gauge. Just be careful not to overload it.

Key feature and strengths

Stated weight of 0.3 kg, 14 L capacity, adjustable shoulder strap, front zip pocket and suitcase attachment strap.

Recommended for: Premium enthusiasts
GASTON LUGA lightweight packable duffel bag, black

GASTON LUGA lightweight packable duffel bag - Black

Why this choice suits this profile: This model focuses on a packable, versatile design, ideal for travellers who want to keep an extra bag inside their luggage.

How this product avoids the pitfall

Its packable design means you’re not carrying a bulky bag when it’s not in use. However, don’t automatically assume it’s an under-seat bag without checking its dimensions once unfolded.

Key feature and strengths

Recycled polyester, stated internal capacity of 23 L, two external pockets and adjustable straps.

Recommended for: Specific uses and heavy users
Kono expandable travel duffel bag 36 L, black and brown

Kono expandable travel duffel bag 36 L with wash bag

Why this choice suits this profile: It’s ideal for weekends, the gym and trips where you need a separate compartment for wet items.

How this product avoids the pitfall

The waterproof pocket for wet items limits contact with dry clothes. With its 36 L capacity, this bag is better suited to weekends or sport than the Ryanair under-seat format.

Key feature and strengths

Stated expandable capacity of 36 L, water-resistant nylon, wash bag and back strap for suitcase.

Recommended for: Frequent business travellers
Kono 40 x 20 x 25 under-seat bag for Ryanair, black

Kono 40 x 20 x 25 under-seat bag for Ryanair, black

Why this choice suits this profile: Its stated size meets the needs of travellers who regularly carry documents, clothes and work accessories.

How this product avoids the pitfall

The stated measurements of 40 × 20 × 25 cm make it easy to check the size before buying. Just don’t fill it so much that it exceeds these dimensions.

Key feature and strengths

Stated capacity of 20 L, weight of 0.48 kg, internal zip pocket, open compartments and back strap for trolley.

Looking for other options?

We’ve put together a comprehensive, real-time updated selection of products that meet these demanding criteria, while also taking European safety regulations into account.

Frequently asked questions

What size bag can you put under the seat with Ryanair?

The permitted size depends on the conditions of your booking. For a personal item, models listed at 40 × 20 × 25 cm are designed to match the required format. Always measure the bag once packed and check the rules on your booking before you travel.

Is a 20 L bag suitable for a weekend away?

A 20 L cabin handbag can work for a short trip if you pack lightweight clothes. For two or three nights, roll your clothes, choose a compact toiletries bag and wear your bulkiest shoes during the journey. A 36 L model will offer more space, but won’t automatically be accepted as a personal item under the seat.

How can you extend the life of a lightweight cabin bag?

Avoid overloading it, clean the fabric with a damp cloth and let it air dry. Never store the bag while it’s still wet and avoid abrasive products. Before each trip, also check the condition of the zips, seams and shoulder strap.