What do Queen Elizabeth, Prince William and Prince Harry always travel with? It may surprise you.
And no, it's not a full mourning suit!
Queen Elizabeth II is one of the most well-travelled heads of state in the world, having travelled constantly since she became queen in 1952. But did you know that she always travels with a bag of her own blood? And so too do Prince Charles and Prince William?
Read more: The Queen's advice to William and Harry
Speaking to Yahoo's The Royal Box, royal expert Duncan Larcombe said: "If it’s the Queen on tour, the royal physician is with them with a bag full of their own blood."
"Just in case something happens."