Brompton Borough Waterproof Bag

This bag is designed specifically for the Brompton front carrier block system. It will not attach to standard bike racks or handlebars without that specific mounting hardware.

It is fully waterproof. The bag features RF-welded seams and a TPU-coated polyester exterior, which creates a sealed barrier against water, ensuring your gear stays dry even in heavy downpours.

The bag includes a dedicated, padded sleeve designed to fit laptops up to 13 inches. If you have a larger device, it will not fit in the sleeve, though it might fit in the main compartment.

This bag is designed primarily as a pannier-style messenger bag rather than a traditional backpack. It comes with a detachable shoulder strap for off-bike carry, but it does not feature backpack straps.

The roll-top closure allows you to adjust the volume of the bag based on how much you are carrying. It also provides a more reliable waterproof seal compared to a standard zipper.

While you can certainly use it for travel, it is not officially 'carry-on approved' as a standard piece of luggage. You should check your specific airline's dimensions, but keep in mind it is optimized for bike commuting rather than air travel.