How to always use a cloth or used plastic bag from home for purchases
It made me
gratified 
"Being conscious worked!"
How I did it: I saved up a whole bunch of old plastic bags, and reusable grocery bags, and put them in accessible places both at home and at work. I'd often remember right AFTER leaving the room that I needed a bag, and made the decision to go back and get a bag rather than to save a few seconds and keep walking. I also started carrying a slightly larger bag when I went out for a little while, just in case I had the urge to buy something impromptu.
