This position does not happen to me often. I really use reusable bags. I need to start to use them at more places due to I refuse to pay for a bag. (Yes I know at Kroger I'm paying for bags it just in the price of the food.) Place the reusable bags in your truck but a note in your phone with your grocery list to get bags. Yes, I have carry items in my hands to my car if I did not have a bag. Or I have taken the cart right to my car. Or I use the empty boxes in the store as things to carry my purchased items in. As a child my Mother would say "if there is a will there is a way". While is did not create this saying it means to me you have to want to change, help, donate, focus on others, and give. Think about what part you are playing in this sustainability process. Good Luck.