Expandable Backpack Buying Guide and Recommendations

By the Joybuy Product Recommendation Officer Published on 18 July 2026

Modern life demands flexibility—we often move seamlessly from the office to the gym or head straight into a weekend getaway after work. Finding a single bag that can meet all these needs can be a challenge. An expandable backpack offers a functional solution by adapting to your changing storage requirements.

This article serves as your guide. It highlights the key features of a versatile backpack and presents a selection of models suited for various uses, each with its own specific strengths. Our goal is to provide you with an objective basis for your purchasing decision.

What to Look for When Choosing an Expandable Backpack

Choosing the right model depends on your individual needs. The following criteria will help you filter your options and make an informed decision.

1. Volume, Expandability, and Carry-On Compliance

A key feature is its variable volume. Pay attention to the base volume for daily use and the expanded volume for travel or larger hauls. For air travel, size is critical. Many airlines limit dimensions for a cabin backpack to approximately 55 x 40 x 20 cm. A good carry-on travel backpack stays within these limits when unexpanded, offering extra space that can be used after check-in. Always check your airline's specific regulations before you fly.

2. Compartmentalisation and Tech Features

Thoughtful interior organisation is essential. A padded, separate compartment is fundamental for safely transporting a laptop or tablet—a feature that defines a good laptop backpack. Models designed for professional use, often called a business backpack, offer additional pockets for documents, pens, and business cards. Another useful feature is an integrated backpack with a USB port. This allows you to charge devices on the go using a power bank stored inside the backpack (not included).

3. Material and Security Features

The material determines the durability and protection of your belongings. Water-resistant (often marketed as waterproof) polyester or nylon protects the contents from light rain. Look for sturdy zips and reinforced seams, especially on the straps and handles. For added security while travelling or in crowded places, anti-theft elements like hidden back pockets or lockable zips are a smart addition.

Top Expandable Backpack Recommendations

Based on the criteria above, we have compiled a selection of models that cover a range of different needs.

Travel Laptop Backpack, Large Expandable 15.6 Inch

What sets it apart: This model is designed for maximum capacity and organisation. With a volume that can be expanded from 29.5 litres to 36.8 litres and a total of 17 compartments, it offers exceptional storage for work, daily life, and short trips.

Pros:

• Expandable Capacity: The volume can be increased by over 7 litres when needed.
• Comprehensive Organisation: Features 3 main compartments, a separate laptop sleeve for devices up to 15.6 inches, and a hidden anti-theft pocket.
• Travel-Friendly Features: An integrated USB charging port and a luggage strap for securing it to a suitcase handle make travelling easier.
• Material: Made from water-resistant and durable polyester fabric.

Who it's for: Ideal for commuters, digital nomads, and travellers looking for an all-in-one solution with maximum storage and thoughtful compartmentalisation for weekend getaways or business trips.

Beneunder LC183, Expandable Backpack 10L

What sets it apart: The focus of this backpack is on minimalist design and an extremely low weight. It combines a slim profile for daily use with a discreetly integrated expansion feature that increases the volume by 30% when needed.

Pros:

• Lightweight: Weighing only about 235 grams (8.3 oz), it is exceptionally light and comfortable to carry.
• Flexible Volume: The capacity can be expanded from 10 litres to 13 litres, ideal for spontaneous purchases or extra gear.
• High-Quality Material: Made from high-strength, soft nylon fabric that is resistant to wind, rain, and dirt.
• Carrying Comfort: Pressure-relieving shoulder straps are designed to reduce the load.

Who it's for: Perfect for minimalists, students, and commuters who need a very lightweight, low-profile, and flexible backpack for their daily journey to work, university, or for light day trips.

35L Expandable Travel Backpack, Hand Luggage Cabin Bag

What sets it apart: This model was specifically designed for air travel. Its dimensions are tailored to the carry-on regulations of many airlines, and the TSA-friendly opening allows for hassle-free security screening at the airport.

Pros:

• Carry-On Optimised: The dimensions can be expanded from 50x35x15 cm to 50x35x20 cm, complying with the requirements of numerous airlines.
• TSA-Friendly Design: The backpack can be opened 180 degrees, so electronic devices do not need to be removed separately during security screening.
• Versatile Carrying Options: Can be carried as a backpack or a briefcase; the shoulder straps are stowable.
• Organised Packing: A suitcase-style main compartment with compression straps makes packing easier.

Who it's for: An excellent choice for frequent flyers and business professionals who prioritise compliance with carry-on dimensions and swift processing at the airport.

Didn't Find the Right Model?

The requirements for a backpack are highly personal. If the models presented here don't exactly match what you're looking for, there are more options to discover.

Explore our full range of expandable backpacks and find the perfect model for your needs.

Frequently Asked Questions (FAQ)

What is the advantage of an expandable backpack?

The main advantage is its versatility. It functions like two bags in one: a compact version for daily use and a more spacious one for travel, sports, or larger shopping trips. This saves you from buying and switching between multiple specialised backpacks.

Does an expandable backpack count as carry-on luggage?

When unexpanded, many models meet the standard carry-on dimensions of most airlines. However, it is essential to check the backpack's dimensions (especially when expanded) against your airline's specific regulations, as these can vary.

How do I use the USB port on my backpack?

A backpack with a USB port has an integrated cable on the inside and an external port. You connect your own power bank (not included) to the internal cable and can then charge your smartphone or another device via the external port without having to open the backpack.