For me, it's easiest for me to keep them handy and hard to forget. I have a reusable shopping bag that has a small pouch attached so that you can stuff the bag into the pouch and cinch it closed. It's nice and small and easily fits into my small purse. That way I have at least one bag with me at all times. I have a zippered bag that is full of additional shopping bags that have a stretchy loop at the top, so you can fold it and roll it up into a small roll and pull the loop around it to keep it tight. That makes it easy to store many rolled bags in the zippered bag, which I keep in my car. It's easy to grab when I step out to shop. I store additional, larger bags in the trunk of my car for trips where I will be purchasing larger items or stocking up.