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Choosing a backpack for a Ryanair flight sounds simple: search for 40x30x20 cm, add a laptop compartment and you’re done. In practice, that’s where most problems arise. A bag might fit the dimensions on paper, but no longer fit under the seat if its compartments are overfilled. Terms such as “water-repellent”, “laptop protection” and “USB port” are also sometimes used as if they all mean the same level of quality.
In this guide, the Joybuy Product Recommendation Officer cuts through the key product information. This helps you compare a hand luggage backpack, underseat backpack or lightweight travel backpack based on features you can check, rather than marketing claims.
The dimensions 40x30x20 cm usually refer to the outside of the backpack. Zips, handles, reinforced back panels and side pockets can all affect the space available. For example, the Kono backpack listing states that the internal dimensions may differ from the external dimensions by around 1–2 cm.
A fully packed bag may also become thicker than 20 cm. So, as well as checking the dimensions, see whether the backpack has compression straps and is flexible enough to fit under a seat.
Water-repellent polyester can help keep out light rain and splashes, but that doesn’t automatically mean the seams and zips are waterproof. If you cycle every day or spend long periods waiting outside, look for a covered zip, sturdy lining and, if needed, a separate rain cover.
A 15.6-inch laptop backpack needs more than just a compartment labelled for that size. Check the height and width of the opening, the padding at the bottom and how the laptop is secured. For commuting, a separate padded tech compartment is more practical than a large main compartment with no protection.
The combination of 40 cm high, 30 cm wide and 20 cm deep is often used for a personal bag that fits under the seat. Airlines may change their terms and conditions, and different fares or ticket types may have different rules. Always check the latest baggage information from Ryanair or the airline you’re flying with before you travel.
When comparing bags, check:
A cabin backpack with a capacity of around 20 to 24 litres is often suitable for clothes, toiletries, documents and electronics on a short trip. The actual capacity depends on the layout and shape of the bag.
A lightweight travel backpack weighing around 0.5 kg leaves more room for your belongings if a weight limit applies. Also look for padded shoulder straps, a reinforced back panel and a top handle. For a commuting backpack, a trolley strap and breathable back panel are extra handy.
A business backpack or school bag works better when your belongings aren’t all in one compartment. Useful features include:
A USB port doesn’t charge a device by itself. You’ll need a power bank inside the bag; the port simply routes the cable to the outside. Also check that you can carry the power bank safely and in accordance with the airline’s rules.
Why it suits this profile: A versatile backpack for school, everyday errands and short journeys. Its layout keeps things organised, without specialist travel features that not everyone needs.
The stated dimensions are 45 x 30 x 18 cm. This means it isn’t a straightforward choice as a Ryanair 40x30x20 cm backpack; check the current baggage rules before flying with it.
Two main compartments, two side pockets and a capacity of around 24 litres. According to the product information, at least 70% of the material is made from recycled materials.
Why it suits this profile: Designed for travellers who want one bag for a short flight, a weekend away and everyday work.
The product information lists external dimensions of 40 x 30 x 20 cm and advises allowing for an internal measurement difference of around 1–2 cm.
Around 24 litres of capacity, a weight of 0.5 kg, three compartments and a padded compartment for a laptop up to 15.6 inches. The exterior is made from water-repellent polyester.
Why it suits this profile: A sensible choice for students and commuters who carry a laptop, charger and everyday essentials.
The product name specifies a 15.6-inch compartment and a lightweight, water-repellent design. If you want to use it as an underseat backpack, check the full external dimensions separately.
Business styling, a 15.6-inch laptop compartment and a USB charging port. The USB function requires a separate power bank.
Why it suits this profile: A good option if you’re looking for a casual canvas backpack for school, work, short trips and everyday use.
The product information mentions water-resistant canvas and a 15.6-inch laptop size. Exact travel dimensions aren’t included in the information provided, so measure the bag before using it as personal hand luggage.
Lightweight design, a flip-top closure and space for a laptop up to 15.6 inches. The canvas design also works well for everyday use beyond the airport.
We’ve put together a complete, up-to-date list of products that meet these strict selection criteria and the applicable European safety regulations.
Not always. The dimensions may refer to the outside of the bag, and an overfilled backpack can bulge. Keep it flexible, use compression straps where possible and check the current Ryanair terms and conditions for your ticket.
For one to three days, around 20 to 24 litres is often practical, depending on your clothes and shoes. A larger capacity isn’t necessarily more convenient: the bag may be heavier or harder to fit under the seat.
It depends on how you’ll use it. A USB port is particularly handy for commuting and long travel days, but it only works with a power bank. For occasional flights, a well-padded laptop compartment without USB may be enough.
