The bike at the top-right
of the page, owned by Robert White of Tampa, Fla., has Wixom bags.
They're made of fiberglass.

The above bags are also
made by the Wixom Company.

Craven bags were made
in England and it's not uncommon to see them on /5s, /2s and their
contemporary British bikes. Elegant in appearance, these bags usually
cost about twice as much as the Wixoms, Bates or Enduros in similar
condition.
There's another bag called
"Enduro Bags" too. These are usually seen on BMW /2 series.
Rich Spehar has a set. Notice the taillights.

Bates bags are common.
It's not uncommon for the lids to fly off at speed if they're not
properly fastened.
BMW offered
leather bags as am option for the /5. Made of a hard leather,
these bags mounted on frames. What they lacked in load capacity,
they made up in style. If you have these, pack light.
The Softbags
as seen on Jeff Olsenholler's /5 will get the job done too. If you
have more than one motorcycle, consider them. They're available
from a variety of catalogs or your local motorcycle shop.

Krauser bags come from
later BMWs, but also fit the /5, look good and work well. Made of
ABS plastic, reproductions are available new from Hepco & Becker.