Code BlueCode Blue, a zero-calorie, all-natural functional beverage, was originally introduced in cans. After discovering that consumers were mistaking the product for an energy drink, the company moved the product from cans to 12-ounce PET bottles. The bottles feature shrink sleeves from Overnight Labels, which allowed the brand to maintain the sleek and brilliant look of the can, the company says. The neck and bottom of each bottle feature a different color to indicate flavor and variety differentiation.