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
Most of the time, plot armor. I can’t remember the last time I’ve seen a pack or bag in a movie or tv show that appeared to have what it should have in it.