Straws and plastic bags get all the heat, but they are actually a pretty small proportion of plastic produced and littered. Straws are like .001% of plastic in the ocean, vs. 50% for discarded fishing equipment.
Those "flimsy" plastic bags in particular have a ~65% re-use rate in the US, whereas the heavy duty "reusable" bags often take far more plastic and energy to product, so you have to re-use them at far higher rates than the flimsy ones to make up for the cost to produce them.
40% of shoppers who have those bags forget them, so there's a world where we are actually producing more plastic and incurring food born illness from people not washing out their re-usable bags.
People not even trying to recycle is a huge pet peeve of mine, but I think the plastic bag bans tend to be kind of stupid. Nevermind that now people have to buy garbage liners instead of just re-using the bags.
https://reason.com/archives/2015/09/01/plastic-bags-are-good...
I would like to see something to get the soda industry back to aluminum, but even moving to glass the costs of it all are not very easy to track, because the significantly higher impact on energy required to move glass in bulk vs. plastic.
One good move you can make is do things like purchase bar-form soaps and shampoos for your bathroom… but ultimately we've got to get people off of K-Cups and buying so much plastic bottled water when they can just re-fill something, or bring your own container to a coffee shop.
And maybe give up on 2-day shipping from Amazon, or try to bulk-ship your order instead of placing a new one for every item you think of 30 minutes apart…
The closest solution will probably come from some kind of plastic-consuming bio engineering, or energy-harvesting incinerators like in parts of Europe and Africa: https://www.cnn.com/2018/08/21/africa/reppie-waste-to-energy...
That, and maybe move away from the "big blue bin" which has made people think they can just throw anything in there which has had the unintended consequence of causing recycling to cost much more and have way more contaminants.