Choosing a 40x30x20 cm Ryanair cabin backpack: a practical buying guide for travel and everyday use

A 40x30x20 cm Ryanair cabin backpack might seem straightforward to choose on paper. However, small differences in dimensions, compartments and comfort can lead to extra costs or an awkward journey. This is especially important when flying with a budget airline: don’t just look at the capacity in litres.

Look out for these common pitfalls before you buy:

• The external dimensions are underestimated. A 40x30x20 cm backpack may be larger than expected once its side pockets are full or you factor in handles and protruding zips.
• The capacity is taken at face value. A stated capacity of 24 litres doesn’t tell you much if the main compartment is narrow or the laptop compartment takes up a lot of space.
• “Water-resistant” doesn’t mean waterproof. According to the product descriptions for some models, water-resistant polyester helps protect against light rain, but that doesn’t mean the bag will stay protected in prolonged wet weather.
• A laptop compartment won’t necessarily fit every laptop. Check that your laptop really fits the stated size and that there’s enough padding.

Which specifications should you check?

1. Dimensions and Ryanair personal item

The dimensions 40 x 30 x 20 cm are often used for a small personal bag that needs to fit under the seat. Always check Ryanair’s current baggage allowance before you travel. Airlines can change their rules, and your bag may still be checked at the gate.

Be aware of the difference between:

• External dimensions: including the outer material, handles and any protruding parts.
• Internal dimensions: the usable space inside.
• Compressed dimensions: some backpacks have compression straps, but these won’t necessarily make the bag smaller in every direction.

A lightweight cabin backpack weighing around 0.5 kg leaves more room for clothes and accessories than a heavier bag with similar external dimensions.

2. Compartments, laptop pocket and comfort

For a business trip or commute, a cabin backpack with a laptop compartment is more practical than one large compartment. A separate section stops your laptop from sliding around between shoes, cables and clothes.

Check the following in particular:

• Is the laptop compartment suitable for a 15.6-inch laptop?
• Is the compartment next to the back panel?
• Is there padding at the bottom and on the sides?
• Does the main compartment open fully, like a suitcase?
• Can you quickly reach your passport, phone and boarding pass?

Padded shoulder straps, a breathable back panel and a trolley sleeve are handy features for students and commuters. A cable pass-through can be useful, but check that you use a power bank safely and follow the instructions.

3. Material and everyday care

Polyester is lightweight and often used for lightweight travel backpacks. A water-resistant finish can come in handy on a short walk from the station to your hotel. To clean the bag, use a soft, damp cloth and avoid harsh cleaning products if the product information advises against them.

A sturdy zip, reinforced handle and well-finished seams matter more than decorative details. With frequent use, zips and shoulder straps are often the first parts to show signs of wear.

Recommended models for different types of user

Suitable for: Budget-conscious first-time buyers

Kono Ryanair Cabin Backpack 40x30x20cm

Why it suits this user: This model combines the sought-after external dimensions of 40x30x20 cm with a weight of around 0.5 kg and a capacity of approximately 24 litres. It’s suitable for short trips, weekends away or as your first underseat backpack.

How this product helps you avoid the pitfall

The stated external dimensions and low weight make it easier to check the bag in advance. Bear in mind that the internal dimensions may be around 1 to 2 cm smaller.

Key benefit and features

Approximately 24 litres of capacity, a main compartment that opens 180°, three compartments and a padded pocket for a 15.6-inch laptop.

Suitable for: Buyers looking for top quality

15.6 Inch Business Laptop Backpack

Why it suits this user: This business backpack is designed for work, study and commuting. It has a slim profile, a laptop compartment for a 15.6-inch laptop and a USB charging port, according to the product description.

How this product helps you avoid the pitfall

The focus is on a separate laptop compartment and everyday use, rather than simply quoting a large capacity in litres. Check the exact external dimensions yourself to make sure it meets Ryanair’s requirements.

Key benefit and features

Suitable for a 15.6-inch laptop, with a lightweight design and water-resistant properties according to the product information.

Suitable for: Specific needs and frequent use

15.6 Inch Vintage Canvas Laptop Backpack

Why it suits this user: This canvas backpack is a good fit for students, commuters and anyone looking for one bag for school, work and short trips. Its flip-top fastening and spacious layout are designed for everyday use.

How this product helps you avoid the pitfall

The product information describes a water-resistant finish, but doesn’t claim that the bag is waterproof. Use a separate cover if you expect to be out in heavy rain for a long time.

Key benefit and features

Suitable for a 15.6-inch laptop, with a lightweight canvas design for school, work and travel.

Handy accessories for travelling

If you like to read in the evening in a hotel or on a train, you could take a portable reading light. According to the product description, the Xiaomi Reading Light Bar Magnetic White has a magnetic attachment, three brightness levels and a built-in battery. Use the device indoors and follow the safety instructions provided.

A compact e-reader, such as the Bigme B751C S, can save space compared with carrying several books. For electronic accessories, check the battery rules and only bring chargers that are suitable for the product.

Frequently asked questions

Will a 40x30x20 cm backpack always fit under the seat on a Ryanair flight?

Not necessarily. The dimensions must meet the current requirements, and the backpack mustn’t be so full that it bulges. Check the handles, side pockets and zips too. If you’re unsure, choose a model with compression straps and keep the external dimensions in mind when packing.

How many clothes will fit in a 24-litre backpack?

It depends on how bulky your clothes are and what else you’re packing. For a short trip of two to three days, you can usually fit a few outfits, underwear, toiletries and accessories in a well-organised main compartment. A laptop and shoes take up quite a lot of room.

Will a 15.6-inch laptop compartment fit every laptop of that size?

No. The actual dimensions of laptops vary by make and model. Measure your laptop and compare it with the internal dimensions of the compartment. Also check that there’s room for a protective sleeve without making the backpack bulge too much.