As of yet I haven't seen one made for a Ryker with luggage, I've been kind of keeping an eye out for one myself. I purchased the UltraGuard pictured below from Amazon last year and it fit perfectly, until I added the luggage. Now it doesn't fit over the side cases, but does fit over the top case. It just wont stretch out enough to get it over the side cases. I was thinking about trying the UltraGuard cover for the Spyder RT, since its made to fit the RT with luggage. Slingmods has it for $67.00, also pic below. I see you have an RT as your avatar, do you have a cover for it?
Spyder RT Cover