I bought a second hand Brompton bike a few months ago, and it's improved my life manyfold! Living in a very small space (a narrowboat), it means I can easily store my bike indoors keeping it safe both from theft and the elements.
Then carrying stuff became an issue. When I started off my mum was kind enough to lend me her Brompton-bag. These are amazingly sturdy, well designed and durable pieces of kit, and their price tags reflect this. Not wanting to part with more money or sacrifice precious storage space (again, narrowboat), and owning 8 Ortlieb panniers, I knew there must be a way to adapt one to fit a Brompton. And that's what this instructable is about.
Here's a breakdown of the pros and cons of the final result, before you get started
I've kept this instructable quite vague so that it can be used with any type of pannier. Its main purpose it to show people that it can be done, what materials to get and what to expect.
Make sure you get all of your tools and materials ready before you start! If you have everything ready and are fairly confident, this can take less than 3 hours.
If you have all the tools and an Ortieb pannier, the cost of making this should be between £20 and £30. The only material you need besides the Brompton bag frame (£20) are 2 aluminium poles that shouldn't cost a lot (or they'll be free if you know the right people!