A Different Situation
The yellow bottle cap situation is a bit different. They’re limited like the colored cans. However, compared to the formula used in regular Coca-Cola, there’s a slight variation in the ingredients of the drink if it comes in a bottle with a yellow cap. The colored cap may not mean a particular flavor, but the formula of the drink is a bit different. The difference is probably not noticeable to many people, though.
A Different Sweetener
Regular Coca-Cola has high-fructose corn syrup, but the drink inside bottles with yellow caps do not. Instead, those drinks contain a different type of sweetener called sucrose – a substance derived from both cane sugar and beet sugar. On paper, that may appear fairly random, but there is a reason the drinks giant decided to swap out just a single component and keep everything else. And the move is for a specific group of people.