In preparation for my drive up to Maine I was thinking about throwing the light gear (tent, clothes, girlfriend, etc.) up on the factory roof rack in a waterproof cargo bag. We have two stowaways joining us so I need to free up some space in the truck. Does anyone have any recommendations on a waterproof cargo bag? I don't like the bags made by Thule or Yakima. I'm leaning towards the ROLA platypus roof bag. I also noticed that Slee has a nice roof bag but they don't list the dimensions. I'll have to give him a call. Thanks.