Let's start refusing to get food in styrofoam and keep reusable containers in your cars or take them when you go out for food or groceries.
I remember last week I forgot to take cloth bag for groceries and I used one plastic bag to carry my groceries. The staff at jalal sons asked me to pack it in different designated bags which I refused saying I forgot mine so I don't want to add unnecessary plastic bags.
He was surprised and thanked me saying Ma'am most people get offended if we pack them in one.
So, MOST PEOPLE either get your cloth bags with you or use less as much as possible.
No one can do 100% but atleast start with yourselves by refusing one.
For more details https://www.dawn.com/news/1400711