This has been working so well that I spent the weekend fashioning a mold and casting a prototype in fiberglass. It's a solid piece with no steel parts, the hooks and brace are part of the form now. Here it is sitting on my desk:



I really like the convenience of putting it on, easier even than using my rack with webbing. And the aero of course. So now I want a real one, with a nice smooth airfoil shape and integrated bag. I'm going to field-test this on my commutes, figure out what revisions I need, and if I still like it I'll cast one in carbon fiber. The fiberglass setup weighs 10 ounces, so CF should be a bit less right?