There is a large suitcase, a standard wheeled carry-on, and a backpack with a laptop, while the website clearly states only the large suitcase and the wheeled carry-on. Will they charge an extra fee for the backpack at check-in? Or are backpacks/purses not considered extra baggage?
No, they are very loyal. I flew from Larnaca Emirates to Moscow in May. I had a large suitcase, hand luggage, and a fairly large backpack. They didn't even pay attention to the backpack.