That is the standard Brompton Touring Pannier. Brompton (sorry if you know this) make a plastic part, the front luggage block, that fixes to the bike's head tube. All the front luggage has a corresponding socket; it's lowered down onto the block and clips in place.
If you have the low flat S-Type bars you can't use the Touring Pannier and, I think, some of the other large front luggage.
I don't have the rear rack because anything on it interferes with the fold. However I use a Brooks saddle with bag loops; a traditional saddlebag dangling from them doesn't interfere with the fold and the largest ones are satisfyingly huge. What it does do is gently tickle the backs of your legs every now and then to remind you it's there, so I prefer the front luggage if I've only got enough kit for one bag.
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If you have the low flat S-Type bars you can't use the Touring Pannier and, I think, some of the other large front luggage.
I don't have the rear rack because anything on it interferes with the fold. However I use a Brooks saddle with bag loops; a traditional saddlebag dangling from them doesn't interfere with the fold and the largest ones are satisfyingly huge. What it does do is gently tickle the backs of your legs every now and then to remind you it's there, so I prefer the front luggage if I've only got enough kit for one bag.
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