I use the Dowco, Iron Rider overnight bag. It opens on 3 sides from the top, has all the tie downs you'd ever need and also has 1 larger and 1 smaller bags that mount easy together. A rain cover is included too. It's fits perfectly on the rack. I got my rack from Fast Eddy as well. Here's the link for the bags: http://www.dowcopowersports.com/resources/cover_guide/iron_rider_luggage/

Have a heart that never hardens, a temper that never tires, a touch that never hurts. - Charles Dickens