A collar can be placed in the outside rim of the tray. This makes the packaging unit stackable (in combination with the Gerona lid). The collar also provides extra protection for the gerberas. Collars for the Gerona come in three heights – selecting the right one depends on the type of interior.
 
All Gerona collars are printed in 3 colours. The collars are made of b-flute corrugated cardboard.