Choosing a Ryanair cabin bag backpack: how to avoid a costly mistake

A Ryanair cabin bag backpack may seem easy to choose, until you reach the gate and find that it won’t fit under the seat or the laptop compartment is too small. Travellers looking for a lightweight bag for a weekend away, a business trip or the daily commute often run into the same problems.

The main pitfalls:

• Dimensions are easy to misread. A bag measuring 40 x 30 x 20 cm is not the same as one measuring 40 x 20 x 25 cm. Always check which baggage category applies to your booking.
• The usable capacity is smaller than the external size suggests. Padded straps, laptop protection and zipped pockets all take up space. So a stated capacity of 24 litres doesn’t mean you can fill it with 24 litres of belongings.
• Lots of pockets don’t automatically make a bag practical. A USB port, RFID pocket or expansion zip may sound useful, but pay attention to the position of the laptop compartment, zips and straps too.
• A laptop backpack isn’t always suitable as cabin luggage. A bag designed for daily work may be too deep for an underseat limit, especially when fully packed.

What size should a Ryanair backpack be?

Before buying, check Ryanair’s current baggage rules and the conditions attached to your ticket or any extra baggage. The permitted size can vary by baggage category. Measure the backpack externally, including handles, side pockets and any protruding parts.

Pay particular attention to these measurements:

• 40 x 20 x 25 cm: a common size for a personal item that needs to fit under the seat.
• 40 x 30 x 20 cm: a common size for a larger cabin or personal bag, depending on your booking and airline.
• Weight: a lightweight cabin backpack leaves more room for clothes and travel essentials.

A 40x30x20 cm Ryanair backpack could be a good option for short trips, but first check whether this size is permitted with your ticket. Other airlines, such as easyJet, Wizz Air, TUI and Vueling, have their own limits. A bag that fits one airline’s rules won’t necessarily be suitable for every flight.

Three technical points to check

1. External dimensions versus usable capacity

Don’t just look at the capacity in litres. Check the exact height, width and depth, and consider how much room the laptop sleeve and protective lining take up. A 180-degree opening can make it easier to pack clothes flat, while compression straps help keep the bag compact when it isn’t full.

For a short city break, around 20 to 24 litres is often practical. For everyday use with a laptop, books and lunch, a larger bag may be more suitable, but it could exceed the dimensions for an underseat backpack.

2. Laptop compartment and protection

If you’re looking for a cabin bag backpack with a laptop compartment, compare your screen size with the internal dimensions of the compartment. A 15.6-inch laptop won’t automatically fit every bag described as a “laptop backpack”.

Look for:

• a separate, padded laptop compartment;
• enough room for the charger;
• protection from contact with zips;
• a fastening to stop the laptop sliding out of the compartment;
• a suitable size for your device, such as 15.6 inches.

A travel backpack for a 15.6-inch laptop is practical for business travellers, students and commuters, but check the overall weight too. A heavy empty bag can make a short flight less comfortable.

3. Comfort and materials

For a business travel backpack or a laptop backpack for work and travel, useful features include padded shoulder straps, a breathable back panel and a sturdy handle. A chest strap can help keep the shoulder straps secure on longer walks.

Polyester and Oxford fabric are often used for this type of bag. “Water-repellent” doesn’t mean the contents will stay waterproof for a long time. Use a rain cover in wet weather or give your electronics extra protection. Also check that the zips run smoothly and the seams are sturdy enough for heavy use.

Our recommendations for different needs

Suitable for: Budget-conscious beginners

Kono Cabin Bag 40x20x25 for Ryanair

Why it suits this profile: This model is designed for travellers looking for a compact bag for a short flight or city break. It has a stated capacity of 20 litres.

How this product helps you avoid the pitfalls

The stated dimensions of 40 x 20 x 25 cm make it easier to compare the bag with baggage rules. Check the current conditions of your booking before you travel.

Key benefit & features

Compact size and 20-litre capacity, suitable for the essentials on a short trip.

Suitable for: Shoppers looking for premium quality

HP Travel 25L 15.6-inch laptop backpack

Why it suits this profile: A good choice if you want to carry work essentials, clothes and electronics in one well-organised bag. It has a capacity of 25 litres, expandable to 30 litres.

How this product helps you avoid the pitfalls

The multiple compartments help keep your belongings organised. It measures 32 x 24,5 x 44 cm, so check in advance that it meets your baggage allowance.

Key benefit & features

Suitable for laptops up to 15,6 inches, with an RFID pocket, chest strap and expandable capacity from 25 to 30 litres.

Suitable for: Specific needs & frequent use

Kono Ryanair Cabin Backpack 40x30x20 cm

Why it suits this profile: This bag is designed for short trips, commuting and business travel when you need to carry a laptop and clothes together.

How this product helps you avoid the pitfalls

The external dimensions of 40 x 30 x 20 cm and weight of around 0,5 kg are clearly stated. Don’t overpack the bag, and check the baggage category for your ticket.

Key benefit & features

Around 24 litres of capacity, three compartments, a padded compartment for a 15,6-inch laptop and a trolley strap.

Frequently asked questions about Ryanair cabin bag backpacks

Will a 40 x 30 x 20 cm backpack always be accepted by Ryanair?

Not always. The permitted dimensions depend on the baggage category and type of ticket. Check Ryanair’s current conditions before you book, and measure the fully packed backpack externally.

How many clothes fit in an underseat backpack?

It depends on the capacity, material and how compactly you pack. A bag of around 20 to 24 litres may be suitable for the essentials on a short trip. Bulky clothes, shoes and a laptop take up a relatively large amount of space.

Is a laptop backpack suitable as a weekend bag?

It can be, if it has enough capacity and offers a spacious main compartment as well as a laptop compartment. Check the weight and external dimensions. A business travel backpack with plenty of protection and pockets may be heavier than a simple weekend bag.