You are right. I was estimating it’s thickness based on the appearance of the radii and the differences in battery capacity. That Anker power pack is 16mm/0.63

You are right. I was estimating it’s thickness based on the appearance of the radii and the differences in battery capacity. That Anker power pack is 16mm/0.63 inches thick. The iPhone 12 is 7.4mm/0.29 inches thick. Looking at how Apple design it’s products, I would be surprised if Apple made this thicker than the iPhone and that phone is less than half the thickness of the Anker power pack. Saying it is slimmer than the Anker seems like a reasonable assumption.