@Confusicated, I could only find this regarding dimensions…
“With a volume of 580-litres to 720-litres under the luggage shelf (with the second row seats in place), and up to 1,630-litres with the second row seats folded down, New C5 Aircross SUV has the largest boot in the segment. The boot’s broad opening (1,017mm) and cubic shape (length 999mm and up to 1,907mm with the rear seats folded down; height under luggage shelf of 583mm) makes it easy to load the bulkiest items.”
Taken from here, about halfway down. There’s also a picture which may give a better idea of size in conjunction with measurements: