A foreign student asked me in front of the convenience store refrigerator. "Why do I get another bread for free when I buy milk?" At the checkout, this is usually what gets said. Cashier: "This is a 2+1. Go get one more." Customer: "Can I bring a different one?" Clerk: "Yes, as long as it has the same promotion label." ## Breaking Down the Conversation "2+1" means that if you pay for two, you get one more free. "1+1" means you get two for the price of one. The "promotion label" is a small label attached to the shelf. Products with the same promotion label can be paired with each other. ## Why bundle different products together? Companies that make products want people to try a new or little-known product at least once. If it's placed next to a popular product, customers can pick it up without feeling any pressure. Convenience stores benefit too, since customers buy more in one go. Many people live alone, so buying several small packs at once is also common. ## How to use it right away - Make sure to grab your bonus item before you pay. It may be difficult after you've paid. - Promotions change often and differ from one convenience store chain to another. Check the shelf label or that convenience store's app. - Promotional items from different convenience stores can't be combined.