Fukubukuro, n. [Japanese] “Lucky Bag”

Via Infinite Loop: Fukubukuro offered at Japan Apple Stores,

“In past years, Apple has participated in a Japanese mercantile tradition of offering Fukubukuro, or “Lucky Bags,” to customers in its retail stores in hopes of bringing in more sales. In Apple’s case, this would be a grab bag of some sort filled with stuff that the customer can’t see, but sold at about half the value of the contents inside.”