Why would your clothes, bag, electronics, etc be outside at night??? Your food should be in a tree, not your pack.

I guess I misread your first post, assuming you HAD a pack cover already but weren't happy with its coverage. So it seems you're REALLY concerned about rain during the day, not the night. I put my clothes and bag in a trash compactor bag and electronics in ziplocs. Since I do freezer bag cooking, so is my food. Pretty simple.

If by some chance you were to fall into a river, no pack cover will keep your gear dry while mine will be perfectly fine.