Wash all bags regularly, after every use if necessary.
Use bags that are easy for the cashier to fill.
Place your reusable bags at the front of your grocery order on the conveyer belt so the cashier knows you have them and want them to be used. Don’t freak when the cashier starts putting your groceries in plastic bags if you haven’t let her know you have reusables.
Separate all bags so the cashier can easily grab each one as needed.
Open bags that fold up into themselves while you are waiting in line. Don’t make the cashier wait for you to open them or worse, make the cashier open them.
Let the cashier know how you want your order handled if you don’t have enough reusable bags. Realize it’s your fault for not bringing enough and politely say something like “I’d like the remaining groceries to be put in paper bags, please.”
Remember when you bring reusable bags that many cashiers see you as a representative of all environmentalists. Being on your “high horse” can turn people off wanting to do good.
Show respect to your cashier by saying please and thank-you, helping to bag, smiling, and staying off your cell phone while she is waiting on you.