Regular Coca-Cola in the U.S. has traditionally used high-fructose corn syrup, while the Passover version may be made with cane sugar and receive appropriate kosher certification. The yellow cap helps shoppers easily recognize this special version.
Over time, yellow-capped Coca-Cola has also become popular with people who simply prefer the taste of cane sugar. Some say it tastes slightly different or cleaner, although preferences vary from person to person.
Because these bottles are usually produced only around Passover, they can be harder to find during the rest of the year. So the yellow cap is not just a packaging choice—it identifies a seasonal Coca-Cola made for specific dietary and religious requirements.
