In the beginning of the year many stores sell bags called, “Huku-bukuro.” There is no specific term in English but “Happy bags” would be close to describe it.
What are in bags? Well, no one knows except the person who put things in the bag. All bags are covered so no one can see inside. But things inside of the bag cost much more than the price of the bag. For example, if the bag is sold 1000-yen, the value of the things inside could be 3000-yen even more.
You will be happy if you like things in the bag. If you don’t get what you want, you will still be happy as you get them a great deal.