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Flying with budget airlines is a cost-effective way to discover new places. However, a common pitfall is the strict and often confusing baggage policies, which can lead to unexpected extra fees at the gate. In particular, the allowance for the free "small personal item"—often limited to 40x20x25 cm by airlines like Ryanair—poses a challenge for many travellers.
This article serves as a practical guide. We will introduce you to a selection of backpacks tailored to these specific dimensions. Our goal is to help you find a suitable model that is not only compliant but also functional for your short trips.
Choosing the right backpack depends on several factors. Here are three key points to consider in your decision.
The most critical feature is adherence to the specified dimensions. A 40x20x25 carry-on backpack is specifically designed to be stowed under the seat in front of you as a free personal item. It is advisable to re-check your airline's exact regulations before each trip, as they can change. A backpack that precisely matches these dimensions minimises the risk of extra charges.
Since every gram counts when flying, a lightweight travel backpack is a major advantage. Models made from durable and water-resistant polyester offer a good balance between low weight and longevity. Pay attention to the solid construction of the seams and zips, as these are put under a lot of stress with frequent use.
A well-designed cabin backpack makes packing and accessing your belongings much easier. Features like a clamshell-style opening, which allows the main compartment to open completely, are particularly practical. Additional compartments for laptops, travel documents, and a trolley sleeve for attaching to a suitcase handle enhance travel comfort and make the flight backpack a versatile companion for both men and women.
Based on the criteria above, we have curated a selection of backpacks suitable for budget-conscious travellers and minimalists.
Why This Model Stands Out: This backpack was specifically designed to meet the 40x20x25 cm carry-on dimensions exactly. With a 20-litre volume, it offers enough space for the essentials on a short trip.
Advantages:
Who is this model for? Ideal for travellers who frequently fly with Ryanair or other airlines with similar restrictions and are looking for a straightforward, compliant solution for weekend getaways or business trips.
Why This Model Stands Out: Similar to the brown model, this version places a strong emphasis on a smart compartment layout and durability, making it a reliable 40x20x25 underseat bag.
Advantages:
Who is this model for? Perfect for organised travellers who value a clear separation of clothing, tech, and travel documents and need a durable bag for regular use.
Why This Model Stands Out: This expandable backpack offers flexibility for different travel needs. Its capacity can be adjusted when required, making it highly versatile.
Important Note on Dimensions: Please be aware that with its standard dimensions of 50 x 35 x 15 cm (expandable to 50 x 35 x 20 cm), this model meets the requirements for the larger, often paid-for carry-on baggage of many airlines. It is not suitable for the free "personal item" size of 40x20x25 cm.
Advantages:
Who is this model for? Suitable for travellers who want a single, adaptable backpack for various airlines and trip durations and plan to use it as their main carry-on item.
If you want to explore more options for different needs and airlines, you can find a wider selection in our category for flight-approved carry-on backpacks.
These dimensions refer to the maximum size allowed for the smallest, usually free, personal item on many European budget airlines like Ryanair or Wizz Air. This piece of luggage must fit under the seat in front of you. It is often referred to as a "personal item" or "small cabin bag."
A 20-litre backpack typically offers space for the essentials for a 2- to 4-day trip. This includes a few items of clothing, a pair of shoes, a small toiletry bag, a laptop or tablet, and important travel documents. Efficient packing, such as rolling your clothes, helps to maximise space.
An expandable backpack offers great flexibility. In its unexpanded state, it may comply with carry-on regulations, while offering more storage space when needed. However, caution is advised: when expanded, it will likely exceed the permitted dimensions for a free personal item. Always measure the backpack when it is fully packed and expanded to ensure it still complies with the specific airline's rules.