Are yellow IKEA bags free?

I've noticed that IKEA stores often have those iconic yellow bags available for customers to use. It's quite convenient, especially when you're shopping for furniture and other bulky items. But I've been wondering, are those yellow IKEA bags actually free for customers to take and use? I've heard different opinions on this matter, so I'd like to get a definitive answer. Can you shed some light on whether or not IKEA's yellow bags are indeed free for customers to use, or if there's a charge associated with them? It would be great to have some clarity on this topic.