Joybuy Insights

Choosing a backpack without making the wrong purchase: consider capacity, comfort and materials

A backpack seems easy to choose, until you realise every day that it is too small, awkward to open or offers insufficient protection against a typical British downpour. Marketing terms such as “ultralight”, “waterproof” and “lots of compartments” also do not always tell you enough about how practical a bag really is.

The main pitfalls are:

  • Too much capacity without good organisation: a large bag can still be impractical if your laptop, water bottle and keys all get mixed together.
  • Confusing water resistance with waterproofing: “water-repellent” does not automatically mean that the contents will stay dry during prolonged rain.
  • Looking only at the empty weight: a lightweight backpack can be comfortable, but when the bag is full, adjustable straps, a chest strap or a hip belt are just as important.
  • Ignoring the dimensions: a high-capacity backpack will not always fit well in a bicycle pannier, under an aeroplane seat or suit your body shape.

Which features should you check?

1. Capacity and dimensions

Choose the capacity based on what you actually carry. A 20-litre backpack is often suitable for commuting, school or a bike ride with clothing and lunch. For books, sportswear or a short trip, a 30-litre backpack can provide more space.

For multi-day hikes, you will generally need a 45-litre backpack or 50-litre backpack. Do not just look at the number of litres, but also at the carrying system. A 50-litre model without a good hip belt may be less practical than a smaller bag that stays firmly in place.

Also check:

  • the height, width and depth;
  • whether the laptop compartment is large enough for your device;
  • whether the bag fits under a seat or in a luggage compartment;
  • whether the capacity can be expanded.

For example, the Beneunder LC183 has a stated capacity of 10 litres in its standard configuration and 13 litres when expanded. The product description mentions a built-in expansion design that increases capacity by 30%. According to the product specifications, this is useful when your load varies from day to day, but it remains a compact bag rather than a full-size work or trekking backpack.

2. Carrying comfort and adjustability

A backpack for women and men should not just look good; it should also be adjustable. Consider the width and padding of the shoulder straps, the shape of the back panel and whether it has a chest or hip strap.

For a daypack, school backpack or laptop backpack, padded straps and a cushioned back panel are often sufficient. For cycling, running or walking, a more secure fit is more important. A walking backpack for longer distances will usually benefit from:

  • an adjustable back system;
  • a chest strap;
  • a hip belt;
  • ventilation in the back panel;
  • attachment points for poles or extra clothing.

Also pay attention to the size range. According to the product information, the PELLIOT Trail Running Backpack is available in two sizes. The stated torso length ranges from 38–46 cm for S/M and from 45–53 cm for L/XL. Measure the distance from the prominent bone at the base of your neck to the top of your hip bones before ordering.

3. Materials and rain protection

Nylon, polyester and Oxford fabric are commonly used. However, the material does not tell you everything. The zips, seams and construction also determine how much protection you get.

A water-repellent backpack is suitable for light rain or short journeys, but for electronics, take additional protection during prolonged rainfall. Check whether a rain cover, waterproof laptop sleeve or separate waterproof compartment is included. A roll-top model may offer extra protection through its closure, but always check the specific product description.

Outdoor products sometimes make strong claims. If a brand refers to, for example, an impact-resistant system or a particular level of protection, treat this as a claim made by the brand. According to the product description, the Beneunder LC359 uses polycarbonate panels and outdoor fabric as part of the stated StrongShield system. This provides information about the construction, but it is not a guarantee that the bag can withstand every impact.

Recommended backpacks by usage profile

Suitable for: Budget-conscious beginners
Puma Phase Backpack Black

Puma Phase Backpack Black

Why it suits this profile: This 22-litre backpack is designed for everyday use at school, work, during sport or on short journeys. Its capacity and layout remain easy to manage without needing a large travel backpack.

How this product avoids the pitfall

The stated dimensions, capacity and weight of 300 grams make the choice easy to assess. It has a main compartment, front pocket and mesh side pocket, so “lots of space” is not merely a vague sales claim.

Key benefit & advantages

22-litre capacity, padded back panel, adjustable shoulder straps and reflective print according to the product information.

Suitable for: Shoppers looking for premium quality
Mobi Garden Phantom Pro 3D Dyneema 45L Backpack

Mobi Garden Phantom Pro 3D Dyneema 45L Backpack

Why it suits this profile: This model is intended for backpacking, hiking and trekking, with a stated capacity of 45 litres. The combination of carrying support and separate compartments suits multi-day, lightweight walking trips.

How this product avoids the pitfall

The bag specifies not only 45 litres, but also a hip belt, chest strap, ventilated back panel and separate waterproof hydration compartment. This allows you to assess the practical carrying and storage features in advance.

Key benefit & advantages

Dyneema composite fabric, approximately 1.35 kg, external attachment points and a 3D ventilation panel according to the product specifications.

Suitable for: Specific uses & intensive users
PELLIOT Trail Running Backpack 20L black

PELLIOT Trail Running Backpack Unisex Lightweight Breathable, 20L

Why it suits this profile: This sports backpack is designed for trail running and cycling. Its size options, harness and compartments are tailored to provide a secure fit during intense movement.

How this product avoids the pitfall

The product information mentions an ergonomic harness, multiple compartments and two size ranges. However, check your torso length and waist measurement before ordering; a sports model is not automatically suitable as a laptop backpack.

Key benefit & advantages

20-litre capacity, breathable mesh lining, adjustable harness and hard-wearing grid polyester according to the product description.

Looking for more options?

We have compiled a complete, up-to-date list of products that fully meet these strict selection criteria and the applicable European safety regulations.

Useful choices for different situations

  • For school: choose a school backpack with a padded laptop compartment, a separate front pocket and enough room for books.
  • For work and cycling: a laptop backpack with a water-repellent exterior, sturdy zips and a well-adjustable back panel is a practical choice.
  • For sport: a sports backpack of around 20 to 30 litres provides space for clothing, shoes and a water bottle.
  • For travel: look for a luggage strap, an expandable main compartment and pockets for your passport and cables.
  • For walking: check the hip belt, chest strap, ventilation and attachment points for walking poles.
  • For limited storage space: a foldable backpack is useful as a spare when travelling or shopping, but often has less structure and protection.

Frequently asked questions about backpacks

How many litres does a backpack for everyday use need?

For commuting or school, 18 to 30 litres is usually practical. If you carry a laptop, lunch, sportswear and a coat, choose closer to 24 or 30 litres. For just a few small personal items, a compact 10 to 15-litre daypack may be sufficient.

How long does a backpack last?

Its lifespan depends on the material, zips, seams, load and care. Overloading shortens the life of shoulder straps and fastenings. Clean the bag according to the instructions: many models may only be cleaned with a damp cloth and should not be put in the washing machine.

Is a water-repellent backpack sufficient for cycling in the UK?

Often yes in light rain, but it is not guaranteed to provide adequate protection during prolonged or heavy rainfall. Protect a laptop and documents with an additional cover. Check whether the manufacturer describes the bag as water-repellent, water-resistant or waterproof, and see whether the seams and zips have been additionally sealed.