Outdoor Vehicle Cargo Bag Design

I am developing a rooftop cargo bag that can be mounted on a vehicle roof and used in all weather conditions. I need an industrial designer or mechanical engineer to transform my concept into a production-ready solution... (Budget: $750 - $1500 USD, Jobs: 3D CAD, 3D Modelling, CAD/CAM, Industrial Design, Mechanical Engineering, Product Design, Prototyping, Solidworks)