She also uses a similar tactic when at state dinners.
When sitting down to a meal, it is reported that Queen Elizabeth has an under-table hook which she places her bag on beneath where she is seated.
According to The Telegraph, if she decides to move her bag onto the table, it is a signifier that she is wanting to wrap the meal up within the next five minutes.
Along with her handbags, the Queen also travels with a large amount of luggage when travelling to a new destination.
The tagging system is mostly to help the royal entourage who travel with the family and subsequently carry their luggage.
It ensures no member of the family ends up with the wrong bags being brought to their accommodation.