Well this is odd for a first post but….
This is the size of the large suitcase I have, the A4 sheet is for a size guide. The depth appears to be about 21cm (but the suitcase lid is quite deep so the whole depth is closer to 30cm. From the image you can see that the width is approx 40cm and the length approx 60cm so an overall volume of circa 72,000cm (cubed – approx 72 litres).