So in your head (or your internal plans) you see yourself running to the hills with your powerbank and e-reader, lol..that's silly and not in the least practical.
Folks with actual plans, like me, have a library, a home that's defensible and productive with food, water and resources. We have community and a long-term prep scenario.
If I'm falling back and fleeing my home I'm taking 2 or 3 books to help BUT that's not a prep strategy, it's video game zombie show fantasy.
Books are far superior.