I will try to answer you quickly, as I could say a million things on this topic.
We need to do more research to find out what is found in plastic packaging, as that information is not currently accessible.
Our French counterparts at Citeo are currently doing testing on opaque PET. They are trying to find out what mineral fillers and additives are added to it and see what is being done to that opaque PET once it has been collected to be able to recycle it.
This type of research to find out the composition of plastic is not done very much in Canada currently. So we need to work on that aspect to perhaps be able to develop types of standards and identify what additives give the necessary barrier properties to products sensitive to air, humidity and light. There are some very sensitive products that need those barrier properties, which could not be achieved with plastic alone, fibre, aluminum or glass. So we need to consider that aspect.
I would personally go a bit further. I am an industrial designer and have training in design. I think we also need to examine packaging design. There is a proliferation of single-use packaging and flexible packaging. I also think there may be a form of standardization—that's not the right term—that could be done in terms of design of certain types of packaging, while considering market segments, for example.