A BagTag is a physical label on your bag. If you are competing with other players who have the same kind of tag, then after the competition, exchange your BagTags according to the results. If you got a better score than the other player, and your BagTag number is greater, then you exchange your BagTags with that player. After making the exchange with the other player, please log in to Metrix and set your new number. This will help others get a good overview of the current situation.