Vantaggi
Amcor is a great company to work for. You get a company, in spite of its core business being somewhat harmful to the environment, that focuses heavily on sustainability and ways to make its packaging more environmentally friendly. Furthermore, it's a company that respects diversity within its chain of command.
Svantaggi
I'd say the main con is that you can find very different styles of leadership within the company, some of which can't even be considered leadership, but just "bossing". If you enter Amcor and are paired up with a manager that really takes interest in developing you, then you are in for a great experience. If you are paired with a boss instead of a leader, whose agenda is solely to make him/herself look good - and there are some in there - then you will have a tough ride ahead.