There are times when I take one of my mopeds to the store, just because I enjoy riding them. For my green 1978 NC50, I have had a Banjo Brothers Grocery Bag Pannier and I recently ordered one for the 1981 NC50 and it is almost perfect for the Honda Express. This one is slightly different, but the best part is the hanger clips are a little bigger and fit perfectly on the thicker bars of the rear "Luggage Carrier" (Honda's words).
I really like this thing. I am thinking I might buy one more, in case they change it or discontinue it. Of course, this just shows one of my hoarding problems.
I bought mine from Amazon:
Note this is an Amazon affiliate link. I don't really expect to make any money off of this, but I just want to start understanding the Amazon Affiliate program. So this blog seems as good of a place as any...