Structural rigidity is improved with the 2006 MX-5 Miata, evident when driving over rough pavement or when popping the trunk lid. The old Miata’s trunk is wide but not very deep thanks to the spare donut under the trunk floor. Still, it can swallow a week’s worth of gear for two if you pack very carefully. You can even pop the lid and plop a garment bag right into the old Miata, and if your cargo is too big but lightweight, you can always stash it on top of the collapsed roof because there’s a shallow well. The new MX-5’s trunk is slightly larger in terms of total volume, but the opening is much smaller, and the trunk is deeper but not as long. Plus, there’s no spare tire with the new Miata, and since the top forms a semi-tonneau when dropped, you can’t haul that jumbo sized Charmin home from Costco behind the seats.