Opposition isn't widespread. It comes particularly from the Canadian and American plastic production industry.
This opposition probably serves to strengthen this industry without considering alternatives. There’s an American company that produces glass in Montreal and Brampton, near Toronto. A lot more jobs could be created in those two regions if more glass products were being used. They can be reused 15 times or 66 times, so, many times.
The plastics industry is trying to protect its profits, but we're trying to protect the environment. That's more or less the difference.