I had the chrome rack with side frames for a while - it's poorly made and a bugger to fit - with leather saddle bags (generic, from Ebay). I liked the look of it at first, and the bags were useful of course, but I now prefer the look of the bike without all that crap on the back so I use Kriega luggage, which is brilliant. Well made, tough, quick to get on & off, secure fixing and waterproof. I've got the US20 size, but it comes larger & smaller, and is modular so can be added to. Shown on my W650 but can be used on the Enfield, although a bit fiddly to get the straps under the seat. Easier with a rack.
Kriega pics are a bit small, couldn't find the originals.