Joybuy Insights

Choosing a backpack: a practical buying guide for school, work and travel

A backpack seems easy to choose, until you’re carrying it through a crowded train, a lecture theatre or an airport. One model may look spacious, yet still not fit a 15.6-inch laptop. A bag may be described as water-resistant without being suitable for prolonged exposure to rain. And a USB port will only work if you bring a compatible power bank.

So the right choice isn’t about colour or trends to begin with. It’s about size, organisation, carrying comfort and what you’ll use it for.

Common pitfalls when buying a backpack

1. Confusing external dimensions with internal space

A backpack measuring 40 x 30 x 20 cm has those external dimensions. Zips, lining and pockets take up space inside. Also check that the stated size meets your airline’s current baggage rules. A Ryanair backpack for under the seat must not only meet the external size limit; it must also fit beneath the seat when packed.

2. Assuming “water-resistant” means fully waterproof

Water-resistant polyester or Oxford fabric can help repel light rain. That doesn’t necessarily mean the seams, zips and base will stay waterproof in prolonged wet weather. If you cycle to work with a laptop every day, it’s worth using a separate cover or waterproof inner sleeve.

3. Overestimating the benefits of extra features

A backpack with a USB port usually comes with just a cable and an external socket. The power bank is generally not included, so the port won’t charge your device by itself. A combination lock is also a deterrent, not a guarantee against theft. Don’t leave valuables unattended.

Which specifications matter?

Size and capacity

Choose a size based on what you carry each day:

  • 15 to 20 litres: suitable for commuting, a tablet, lunch and a few accessories.
  • 20 to 25 litres: practical for school, the office or a short trip.
  • Around 24 litres: offers space for clothes for a short trip, especially with a clamshell opening.
  • Over 25 litres: useful for hiking, sport or carrying lots of luggage, but pay extra attention to carrying comfort and weight.

Always check a cabin backpack or hand luggage backpack against the rules of the airline you’re travelling with. Dimensions of 40 x 20 x 25 cm and 40 x 30 x 20 cm are not interchangeable.

Laptop compartment and protection

A backpack for a 15.6-inch laptop needs more than just a compartment labelled for that size. Look for:

  • a padded back panel;
  • a secure closure around the laptop compartment;
  • protection from direct contact with the base;
  • space for the charger;
  • a compartment size that suits your specific laptop.

A 15.6-inch screen size doesn’t tell you everything about a laptop’s external dimensions. Measure your device and compare its size with the product specifications.

Weight, straps and organisation

A lightweight backpack is handy on the train, in a bike basket or on a plane, but a lightweight construction won’t always offer enough protection. Padded, adjustable shoulder straps and a breathable back panel are particularly useful if you’ll be carrying the bag for several hours.

Multiple compartments make it easier to organise books, cables and documents. Too many small pockets can actually reduce the usable space. Think about what you carry every day before you buy.

Our recommendations by use

Suitable for: Budget-conscious first-time buyers
Kono 40x20x25 cabin bag for Ryanair, 20L black underseat travel backpack

Kono Cabin Bag 40x20x25 for Ryanair Underseat Travel Carry-on Backpack Cabin Size 20L Black

Why it suits this profile: Its compact 40 x 20 x 25 cm size and 20-litre capacity make it a good fit for travellers looking for a personal bag for short flights. Always check your airline’s current rules before you travel.

How this product avoids the pitfall

The external dimensions and capacity are clearly stated, helping you avoid choosing a bag that’s too big to fit under the seat.

Key benefit and advantages

Compact size, 20-litre capacity and a design made to fit under the seat as hand luggage.

Suitable for: Buyers looking for premium quality
KONO laptop backpack with USB charging port, water-resistant business travel rucksack, fits a 15.6-inch laptop

KONO Laptop Backpack with USB Charging Port, Water-Resistant Rucksack for Business Travel

Why it suits this profile: This laptop backpack measures 50 x 14 x 30 cm and weighs around 0.73 kg according to the product specifications. It has compartments for a laptop up to 15.6 inches, documents and accessories.

How this product avoids the pitfall

The laptop size, weight and USB requirements are clearly stated, so you’ll know to bring your own compatible power bank.

Key benefit and advantages

Padded laptop compartment, multiple organiser pockets, USB port and detachable combination lock.

Suitable for: Specific needs and frequent use
Kono Ryanair 40x30x20cm cabin backpack for underseat travel

Kono Ryanair Cabin Backpack 40x30x20cm with 15.6-inch laptop compartment

Why it suits this profile: According to the product specifications, the bag has a capacity of around 24 litres, weighs approximately 0.5 kg and has three compartments for short trips, commuting and business travel.

How this product avoids the pitfall

The size, weight and laptop compatibility are clearly specified. Bear in mind that water-resistant material does not mean the bag is fully waterproof.

Key benefit and advantages

24-litre capacity, clamshell opening, padded 15.6-inch laptop compartment, compression straps and trolley strap.

Looking for more options?

We’ve put together a complete, up-to-date list of products that meet these strict selection criteria and the applicable European safety regulations.

Frequently asked questions about backpacks

Which backpack is suitable as hand luggage?

That depends on the airline and your ticket type. Check the current permitted dimensions and compare them with the backpack’s external dimensions. A bag measuring 40 x 30 x 20 cm is different to use from a 40 x 20 x 25 cm model, even though both may be sold as cabin or hand luggage backpacks.

Will a 15.6-inch laptop fit in every laptop backpack?

No. The 15.6-inch label usually refers to the maximum screen size, but laptops come in different case dimensions. Measure your laptop’s length, width and thickness, and check the dimensions of the compartment too. A padded compartment also offers more protection than a simple open pocket.

How do I care for a water-resistant backpack?

Follow the product’s care instructions. For the KONO laptop backpack mentioned above, cleaning with a soft, damp cloth is recommended; soaking it and machine washing are not. Leave the backpack to air-dry completely, and avoid harsh cleaning products that could damage the fabric or coating.