Great bags for the money! I bought them for a trip as a fallback in case the bags I ordered from Spain didn't arrive on time (didn't arrive). I rode at 80-90mph most of the time and they held up great. If you don't have a lot of weight in them, they'll deflate on the freeway, but that's a minor issue. The mold is supported internally by black knurled plastic, the same material used to make yard signs but more rigid. They have held their shape well. What really shines about these bags is that my stuff stays dry. I got a few good showers along the way and left my stuff completely dry. I wrapped my clothes in plastic bags just in case and it was completely unnecessary.