We see them have backpacks or bags but rarely do we see what’s inside. They definitely don’t have clothes since they don’t change into anything. Maybe food,water,ammo but they should have more. Or sometimes there packs are too light like they don’t have anything
I think Cormac McCarthy’s The Road may fit the bill a little bit as far as “hard post-apocalyptic”. I can’t say for sure, as I didn’t finish the book. I found it to be too depressing at the time. Which, duh, but it goes to show that the author is uninterested in the power fantasy that often accompanies the genre.