I didn’t see it when I first used my mesh cupholder with Basil’s Brompton “basket”
but Basil can’t be folded with the basket in place if the cupholder is folded down for use. The angles are wrong, and the basket frame hits the cupholder, so that the hook that holds a folded Brompton together can’t engage.
The difficulty is easily solved by simply removing the basket, but, when shopping, that solution’s not ideal. Of course, the other option is to simply put the water bottle into the basket, and flip the ring and mesh upward — or, in my situation, forego the water bottle altogether on these basket-enhanced trips, since I shop close to home, and can easily get water at the market.
It’s little details like this that make one appreciate how carefully a Brompton is engineered, and how neatly all the bits fit together. I, myself, hadn’t considered all of the ramifications of my water bottle/cupholder fix . . . not that the stakes were high, but it’s well to remember these little missed calculations, in order to avoid them in the future.