Another option for your waterproof bag; I have seen the odd ones around, but not Brompton specific.
https://upsobags.co.uk/collections/ferrybridge-folder-brompton-bag £95 + frame.
But note from the description:
The material itself is waterproof and wipe-clean, but prolonged strong rain may penetrate where we sew the seams
I've got an UPSO ferrybridge - it's properly waterproof. It's quite a heavy bag and is more useful after modding ortlieb pouch/water bottle holders on the back but is good for rainy commutes. IMHO old tbags are the best tho, use a rain cover.
@gojira54 started
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Another option for your waterproof bag; I have seen the odd ones around, but not Brompton specific.
https://upsobags.co.uk/collections/ferrybridge-folder-brompton-bag
£95 + frame.
But note from the description: