Piggy back construction is rather common, but rarely is it seen with RFID.  There are significant benefits to piggy back construction including durability and versatility.  Here is a good source of information.

Our piggyback labels are made from combining two layers, the bottom layer forms the backing for the top. The label can be applied to any object as normal, the top layer can be reapplied elsewhere. Often used on Express mail envelopes, inventory control, asset tracking, reminders, and quick references.  The Nested Polyester label is ideal for thermal printing and infield lamination.  The silicone varnish on the bottom later allows for an easy delamination of the top label.  Printing custom piggyback labels can be challenging – we have the experience to help you select the right combination of label size, materials, inks and adhesives.

Piggyback labels are multi-layer constructions featuring one self-adhesive label on top of another. The top label is removable and can be reapplied elsewhere, while the bottom label is stationary, remaining affixed to the original surface. Dynamic and versatile, piggyback labels can be created in constructions that adhere to paper, plastics, cardboard and metals. Top labels can be smaller than bottom labels for fast and easy removal, or they can be the same size with or without tabs for removal. Whether clear middle-ply features to reveal additional messaging or instruction… as image liner piggybacks offering the convenience of a pressure-sensitive document label with a carbon copy label… or for bar code scanning at checkout when items are too heavy to carry… there’s a piggyback to streamline processes and increase productivity.

RFID Professionals  - Starport Technologies