Coke Zero is being relaunched as part of a 40 million euro programme to encourage consumers to switch to sugar-free drinks.
It's because many people are unaware the brand doesn't already contain sugar. It's being reformulated and renamed as "Coca-Cola Zero Sugar" in June.
"Packaging is our most visible and valuable asset," said Marcos de Quinto, chief marketing officer at The Coca-Cola Company.
"The Red Disc has become a signature element of the brand. By applying it to our packaging in such a bold way, we are taking the next step towards full adoption of the One Brand strategy, uniting the Coca-Cola family under one visual identity and making it even easier for consumers to choose their Coca-Cola with or without calories."