The two guitarists for the Easybeats, Harry Vanda and George Young (older brother of Malcolm and Angus) wrote both these songs and produced the first six AC/DC albums. They knew what they were doing

Airlines should give you one free check in bag, a free briefcase/handbag carry on and then charge for carry on bags put in the overhead locker and additional check in bags. Problem solved. I don't know why they don't do it this way