Brompton Borough waterproof bag - small - navy / grey
This sometimes underestimated bag was originally introduced by Brompton in 2020 - a roll top, with full waterproof capability as an alternative to the now discontinued Ortlieb Mini-O bag
This is the second iteration - introduced with the G Line in 2024
The colour is a slightly different blue from the original, it has some grey and orange detailing and a removable logo - you can choose between G and Brompton logos (they are held on with Velcro)
The Brompton Borough mini waterproof roll top combines a flexible design that can worn as a shoulder bag or a backpack, with more than enough space for a day trip adventure
Made using Radio Frequency Welding, instead of stitching, making the bag completely impervious to water
Brompton Borough small waterproof bag features:
- Capacity (litres) 9
- Dimensions (cm) w30 x h28 x d11
- Colour: Navy Blue / Grey
- 600D TPU coated polyester
- RF Welded Construction: 100% waterproof
- Aluminium hardware with some orange detailing
- Zipped front pocket with YKK Aquaguard zipper (but it's not waterproof)
- Detachable 2-way strap
Brompton 2020 Q part code: Q103612
Our Internal Q part code: QBORBWP-S-NV-GY
Brompton part number: 9068333
Brompton handlebar compatibility:
The Small Borough waterproof bag is suitable for all handlebar types

We made this short video on the original Brompton Borough Waterproof Bag