Aluminum is generally more recyclable, and less expensive than plastic. Coke has come under fire for its single-use plastic production, and late last year cut its sustainability goals. The beverage giant is now aiming to use 35% to 40% recycled material in packaging by 2035, revised down from an earlier goal of 50%.

Coca-Cola may have to sell more drinks in plastic bottles in the US if President Donald Trump's tariffs end up making aluminium cans more expensive, the company's chief executive, James Quincey, said in a call with investors.