Getting used to new habits takes a little time and practice. Some stores have already put up reminder signs to help customers get used to bringing their own bags. Keep your reusable bags in the car, in your purse, or you can invest in a small, collapsible bag that attaches to your keychain for shopping trips. After you unpack your groceries at home, hang your grocery bags by the door or by your keys, so you remember to take them with you. If you forget your reusable bags (at home or in your car), put your groceries back in your cart after you check out and take them to your car to unload.