I hadn't read the "invisible knapsack" but felt like I understood the metaphor as having "baggage" i.e. people who have (roughly) reactions that 1) derive from past experiences and 2) negatively affect their ability to interact with others.
But now I know about the essay bopeepsheep mentioned, I do think I understand more specifically what was meant.
no subject
But now I know about the essay bopeepsheep mentioned, I do think I understand more specifically what was meant.