Prince William: Why the royal always travels with this particular item

Prince William, 36, often travels abroad as part of the Royal Family on state visits, to represent the UK.

He is often joined by his wife, Kate Middleton, 36, as well as his children.

While Prince George, five, and Princess Charlotte, three, have already joined him on a trip, Prince Louis, four months, is yet to join.

There is a particular item that William always takes with him on holiday, and is something that has been part of the family for generations.