The above label from a drink [click on for a larger view] illustrates why in terms of vulnerability we need to think in more than one dimension. The producers of the label write
Smaller Cap = Less Plastic
Did you notice this bottle has an Eco-Slim cap? This is part of our ongoing effort to reduce our impact on the environment. This bottle and cap contain an average of 20% less plastic than our original 500mL.”
Than they had a warning at the bottom
WARNING: Cap is a small part and poses a CHOKING HAZARD, particularly for children.
It seems, in my view, a larger cap but less plastic in the bottle itself would have been a better approach!