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.

Key goals
* Waterproofing optimization for stitched seams under sewing construction.
* Zipper protection (optimizing the water contact angle or completely isolating the zipper from water exposure).
* Ease of use, including convenient installation and removal.
* Optimization of strap strength and secure fastening.