If you are looking for the perfect backpack to go together with your Brompton here is an overview.

But first this:

We're people from a Brussels design agency (imaginif.com) who love traveling, commuting and riding Brompton bicycles!
In our search to enhance our Brompton riding experience, we encountered difficulties to find a solution to carry a normal backpack with our Brompton.

Brompton's own bags all have a frame inside attached, so that's not a solution since it's heavy and hurts on your back.

It took us quite some effort to attach our own Tumi backpacks to our Brompton. We finally found the right accessory with some supplier in China.

It is a front frame rack for your Brompton bike that allows you to attach any backpack with an "add-a-bag sleeve." An "add-a-bag-sleeve" usually serves to slide over another suite case trolley. It is "THE" solution for attaching a backpack, without a frame inside, to your Brompton. It is 20 cm wide (check your sleeve width) and 30 cm high. All the backpacks reviewed here fit on this front carrier frame. The frame locks on the original Brompton front carrier block. (not included) but you can get it here from our store. This is a straightforward, hard-to-find solution for attaching a backpack to your Brompton.

In this guide we help you find the best backpack for your Brompton to commute, travel for business and carry your laptop with you. Each backpack is judged for their special features, carry options and overall design. 

1. Brompton Anti Theft Backpack 15 Inch 

This Brompton backpack for front carrier is an Anti-Theft Smart Backpack and has an external USB port for easy and convenient travel. It is made with soft durable, breathable material.  The S-Type shoulder straps eliminate pain and pressure on the shoulders and spine.  A nylon fixing belt makes travel easy. The shoulder strap is thoughtfully and practically designed with a card pocket. This bag has a large capacity and has multiple pockets for ease and convenience. More detailed description you can find here

2. Brompton Backpack for Front Carrier Large Capacity

Brompton Backpack for Front Carrier Large Capacity.
Can be attached thanks to, it's Add-A-Bag-Sleeve, to your Brompton in combination with our front carrier rack (sold separately here)

This is the perfect pack for when you need to bring your office with you. This spacious, well-organized design features numerous interior and exterior pockets, as well as dedicated space for your laptop, tablet, and other essentials. Exterior pockets include a pocket for a water bottle or umbrella.
Dual-coil zipper break away design increases the strength of the zipper. Padded adjustable straps and leather-wrapped top carry handle. More details you can find here

3. Brompton backpack with an add-a-bag sleeve for front carrier frame.

This is the largest backpack that we tested of 56 liters to fit on your Brompton thanks to the unique front carrier frame. This Brompton backpack designed for use with all handlebars. This bag has a very large capacity, ideal for every day use but also for long road trips. It can contain your 17 inch laptop. It is waterproof and has the option for USB charging. Next to your laptop there are pockets for your tablet, external keyboard, camera, mouse, sunglasses, wallet, a key chain holder and many other items. This bag is expandable by 40%. and has a compartment to put shirts and other clothes. It has a thick shoulder strap buckle for more comfort and a chest buckle. 

The frame is not included but can be purchased here in our shop. More details of this large Brompton backpack you can find here. 

4. Brompton Backpack for front carrier - Ultralight 15.6inch Laptop

This is the thinnest and smallest backpack for your Brompton we found. It has a Laptop case with a soft flannel compartment that protects up to a 15 inch laptop and it can reduce the friction between the backpack and the computer. Invisible anti theft design - unique concealed double zipper increases the security of your stuffs inside. One hidden zip pocket for your wallet and phone. Portability - the back sleeve design allows the backpack to slide over the Brompton backpack front carrier (not included) or the luggage handle for easy mobility during traveling. Classic design - it is a unisex backpack and can be used by Both men and women for carrying to workplaces, schools, trips or other occasions. Exterior Dimensions: 16. 5Inch(h) 11 inch(l) 2. 7 inches), weight: 1. 55 ibs. Suit for 15-15. 6 inch ultra-thin laptop （no suit for gaming laptop）More details you can find here .