From  gammyalways, Tales From Retail:

My store only has plastic bags for customers, and they are rather thin plastic bags so sometimes, yes, they do need to be double if you want your purchases to make it home.

I cannot tell you how many times I have wanted to snap back when customers start lecturing me on using our plastic bags when they didn't bring their own reusable bags. Finally, one time, I did.

When the lady I was checking out saw me putting her purchases in plastic bags, she launched into a long diatribe of why I was personally killing off the environment. I stayed as pleasant as possible, but she would just not let it go and accused me of wanting to singlehandedly kill the earth for my kids and grandkids. That comment was the last straw for me and I was done playing nice. I responded, "No, I don't. Instead, I do adult thing of recycling my bags and use reusable ones. You might want to try it sometime."

She left in a huff. The customer behind her applauded. I was so pissed. Ugh! There are so many other solutions to a store using plastic bags than berating the cashier with zero power. Stupid.

-- gammyalways