The word "福袋" is formed by directly combining the character "福" (fú), which means "good fortune" or "blessing", with the character "袋" (dài), which means "bag" or "sack", resulting in a literal meaning of "fortune bag". It is a compound noun where the first character semantically modifies the second, specifying that the bag is associated with luck, typically referring to a packaged bag of unknown contents sold for promotional purposes.