Utilizing the open real estate on the roof of your car for cargo is a decades-old method of saving on interior space. However, now that modern cars, trucks and SUVs can easily hit 65mph where aerodynamics become a concern means you have to be smarter about how stack gear on your roof. The Thule XT Motion is designed for such a problem. Pack a weekend’s worth of stuff in either the 16-, 18- or 22-cubic foot cargo box and losing MPGs or your duffel bag to highway winds becomes a thing of the past. Today on Amazon you can save up top $157 on a Motion Xt in black or titan grey.