At the least, those heavier plastic bags are less likely to blow away and get into the water and general environment. The heavier bags are more likely to end up

At the least, those heavier plastic bags are less likely to blow away and get into the water and general environment. The heavier bags are more likely to end up in recycling or trash. We use those heavier plastic bags as trash bags as that is about how often we end up with one when we don’t have our reusable ready. It worked out well. Recently the grocery switched to paper bags without handles. Those don’t work as well for trash bags and without handles they are poor grocery bags.