no1mad, been following your thread with racks and pannier bag. Instead trunk rack bag, I just installed a Escape Pod from Planetbike. I can fit a small to medium size light duty back pack inside the pod and take the backpack with me with most of my stuff. It is water resistant. I also mod some pannier to bolt onto the pod which raised the bottom of the pannier. I didn't have any heel strike to begin with but did notice the gain of clearance. I also mod the back with a bar to attach all goodies of rear lightsThe cost of the Pod is about $54. Pricey? Yes and no because some trunk bag can approach that price range.