What do you use to close the truck bed from the rain? I have a pickup truck and am planning a long trip on it. I want my luggage to be safe.

If you are worried about your luggage in an open bed, then I advise you to choose hard tonneau cover for your pickup, this article https://truckpowerup.com/how-to-keep...-in-truck-bed/ has more information about this. You can also find coverings that fit your truck bed there. It really helped me choose a good tonneau cover for my Toyota Tundra. I didn't know how convenient it was before, my cover is easy to install and easy to remove, but it cann't be cut with a knife or opened without a key.