Fukusa refers to a small cloth used to wrap the envelopes (shugi or bushugi envelopes) in which money is put for congratulations and condolences and which helps prevents damage to the envelope.
袱紗（ふくさ）とは慶弔事に贈る金銭を包む袋（祝儀袋・不祝儀袋）が型崩れなど起こさぬように、その上にもう一度覆う小さな風呂敷の事である。