A large part of the Queen's role is travelling around the world meeting other leaders and visiting countries in the Commonwealth.
She always has a packed schedule of meetings and engagements while she's away - all of which require her to be dressed smartly and appropriately.
You won't be surprised to learn that the Monarch doesn't just queue up at the British Airways check-in desk to drop her cases off, and organising and transporting the royal luggage is a huge task.
Dressmaker Angela Kelly revealed some of her secrets in her new book The Other Side of the Coin, and shared one particularly disastrous story about how all of the Queen's outfits were completely drenched thanks to a huge blunder at the airport.
The Monarch doesn't travel light and a ten-day tour can require up to 30 outfits, including back up options for each engagement in case the original isn't quite right on the day.
Years ago, whenever the Queen went away she took three very large, leather wardrobes with her.
These had to be carried to the plane and up the steps by members of the royal team, which wasn't an easy task as they were extremely heavy.
But Angela soon realised they needed to come up with a more practical way of doing it, understanding that it had become "a bit of a nightmare".
Her first idea was to replace the wardrobes with hanging bags, packing two outfits to a bag, and the Queen was happy with the new plan.
Everything went well until the Queen and Prince Philip's trip to Italy in 2000, when they were greeted by torrential rain at the airport.
Despite the downpour, a member of the crew decided to roll the rail carrying all the hanging bags straight across the tarmac. They got completely soaked and things got even worse when they were caught by a huge gust of wind sending the bags everywhere.
Angela writes: "I watched the whole thing happen in slow motion from the plane - I felt so sorry for them scrambling around trying to pick up Her Majesty's soaked clothes."
When they returned to London Angela decided to search for a new alternative to the Queen's luggage situation, popping into House of Fraser to see if they had anything suitable.
She bought a number of lightweight cases on wheels - which they still use today.
Angela writes: "I'm happy to say that this has been a successful and very welcome change."
The cases are packed very carefully to check the weight is similar on both wheels to ensure they don't topple over.
- Angela Kelly's book The Other Side of the Coin: The Queen, the Dresser and the Wardrobe is now on sale.
