Here's a pic of the saddlebags I'm using on my trip around New Zealand's South Island. I just brought some sea to summit big river dry bags with strap holders. Then made a simple alu frame that bolts on the top rack and keeps the bags off the exhaust. The bags are strapped across the top like wolfman bags and to the bottom of the frame. They hold 20 liters each. But I don't think I'll fill them completely as the frame isn't completely rigid.