Each spring, some Coca-Cola bottles appear with bright yellow caps instead of the familiar red ones, leaving many shoppers wondering if the recipe has changed or if they’re looking at a limited-edition product.

The answer is tied to Passover, when specially produced bottles are made with cane sugar instead of high-fructose corn syrup to meet kosher dietary requirements for many Jewish families, while the yellow cap helps customers quickly identify the seasonal version. What looks like a simple color change actually represents decades of tradition, careful planning, and a recipe many fans wait all year to enjoy. That small yellow cap tells a much bigger story than most shoppers ever imagine.