Tonneau covers that don’t leak

I occasionally carry things in the bed I do not want wet at all. Hunting trips mean duffle bags, sleeping bags, pillows, guns/bows, bags of corn, etc. Or a vacation trip without RV means luggage. I had a full hard fiberglass cover on an earlier truck that overlapped the bed rails and tailgate. No way for any water to leak thru at the top. Only possible place was to blow in the small gap between the side edges of the tail gate and the bed. But I also had a Bed Rug that closed that off.

Although I rarely ever carry anything higher than the bed rails, that is a problem with the solid cover. I don’t want a camper shell type cover.