Baggage Weights
Agree with your "balanced" view Prado and I do not think I ever suggested any other reason for the TWU wanting the max 20KG per piece to apply. Interesting to note however that you claim 1000 bags per shift when the TWU's Mr Sheldon stated 600 per shift. Also, most baggage on wide-body international aircraft does go into igloo containers. It is only the rear cargo hold on a B747, for instance, which has loose loaded baggage.
I would love to hear what the "wheat stacker's" of my childhood would say, considering they used to scurry from truck bed to the top of wheat stacks with a bag of wheat across their shoulders, all day long. They still had enough energy left to enjoy a few ales and front up again the next day.