Car Luggage Carrier

Does anyone know of a rack to produce good bags and so on for a 1.000 mile trip this summer? We used to have a Sears X-Cargo (I think that's what it was called) that did the trick. He had enough to hold about 8-10 decent size suitcases. I'm looking for something similar that does not need a bracket on the roof. It will be used on a Hyundai Elantra. Please point me in the right direction. I can not find something useful on the web!

Here is a site that has straps for luggage carrier. These straps can hook onto the luggage and keep them in place by hooking onto the surface of the window.
RoofBag straps with door hooks
An alternative to long straps for cars without roof rack