Piggyback labels are constructed with multiple layers with one self-adhesive label on top of another. The top label can be removed and reapplied somewhere else. The bottom label remains attached to the original surface. This label is also known as a two-layer label or double-layer label, due to the construction and adhesive.
One main application is for marketing promotions and direct mail. Outside of promotions, these labels are also used for shipping returns, inventory marketing and more.