Trademark law interview: How do I go about protecting a form of packaging?

The Coca-Cola bottle

The letter C in the Coca-Cola slogan is trademarked as a wordmark. Photo: Photo by Mae Mu on Unsplash

Kit-Kat packaging

The shape of the article itself or of its packaging can be registered as a trademark. Photo: marqquin, Unsplash

Does this mean that new products have a tougher time getting their packaging protected?

The Jack Daniels bottle

Jack Daniels registered their black background with embellishments as a figurative trademark. The basic design cannot be used by other entities. Photo: Photo by Almos Bechtold, Unsplash

The essential differences between design trademarking and trademarking (3D trademark)