That's a very fair point. This is probably a lifestyle for someone who'd otherwise be living on middle class tech worker wages. It's for people who have the luxury to choose their lifestyle. In no way do I view his backpack and duffel as as a solution to poverty.
Then again, I see your comment pretty frequently in response to minimalism. Maybe because it can look like a vow of poverty, but really is not even close.
Not so useful for people who can't afford to keep buying socks , eat out every single night or live a travelling lifestyle.