Brompton Cover and bag
The Brompton cover and bag is one of the most useful accessories for your Brompton folding bike. The super-light nylon cover slips over the Brompton to either protect it from dust and water or to disguise it when entering office buildings, restaurants or public spaces that would not allow you to enter otherwise. I have never been stopped when my Brompton was under-cover. Also, the bag that attaches to the back of your seat and holds the cover is also useful to hold other things like cell phones and your sandwich.