Go spend 30 minutes reading abstracts in peer reviewed literature regarding pollution from packaging.
If you are trying to reduce carbon emissions from packaging, and you are trying to do it through banning one form of packaging or another, it is a losing battle. The literature is a mess. No study properly accounts for all emissions from harvesting raw materials, production, recycling, the electricity emissions from that production, to give a clear answer which can lead you to accurately pick which form of packaging will have the lowest carbon emissions 100% of the time. This is without taking into consideration long term pollution beyond carbon emissions.
The only way to accurately account for all of the carbon emissions of every stage of production in packaging is through a broad based carbon tax with as few exemptions as possible. It is also the only policy you can implement which will create the incentive to reduce emissions at every stage of production. Every other method miscalculates the true carbon impact. A carbon tax is the only realistic option.