I purchased some accessories for the Engwe L20 combo: rear basket with cargo net, phone mounts, mirrors, and bottle cage.
I can say that the rear basket is very roomy, it allows you to transport large objects with complete peace of mind, the cargo net is very useful and easy to attach. The other accessories are very useful and well made.
I would have also liked to purchase the Engwe branded water bottles, but unfortunately they are not available. Sin