Are the bags at IKEA free?

Excuse me, could you clarify something for me regarding IKEA's policies? I've been wondering, are the bags that customers typically use to carry their purchases out of the store, free of charge? I've noticed that they're quite convenient for transporting larger items, and I'm just curious if I need to bring my own bags or if IKEA provides them as a complimentary service. Thank you for your assistance.