Trademark Application For Bottle Cap

U.S. Trademark Application SN 78643174. The mark consists of 'design of a bottle cap with the words NO-CAL.'
So what does this protect? This isn't a 3-D mark, it's a 2-D mark in the shape of the outline of a bottle cap. I suspect that another soda company could have a logo in the shape of a bottle cap as well. But they may not be able to use a design that looks like this.