If you're looking at this ad, you probably don't need a description! But check out this video: https://www.youtube.com/watch?reload=9&v=0GgmI388Cok (there are others online...).
I bought Brompton bike no. 12069 from Mike at his famously special Leaside shop in the mid-nineties. Eventually I treated myself with this bag, which I continue to use as a nice shoulder bag but now want to sell. (Shockingly, the bike's frame snapped just in front of the main hinge in late 2017—permanently souring my long and loving relationship with Brompton—and no, I'm not selling the bike, it's long gone.)
The bright yellow rain cover is part of the sale. (I only used it once or twice. The bag proper has never been rained upon, although that wouldn't be a big deal...)
Note
I bought this bag at Curbside Cycle for over $390 in 2014. They now have a similar model, but Brompton made it smaller in 2020. (https://curbsidecycle.com/collections/all/products/brompton-game-bag-medium).
