When a student fills his or her bucket, the pom-poms are removed and a sticker is added to the bucket to show that it has been filled up one time.  By the end of the year, students often have many stickers on their buckets.

However, there is no reward for filling up a bucket, and no student is the "winner" for filling his or her bucket the most times. The activity is designed to intrinsically motivate students: it's not a contest or a competition in which students earn an extrinsic reward.