I booked Passat or similar and Europcar was trying to give me a compact car (Volvo V40), claiming that they don't have anything bigger. After my complains, they offered me Peugeot 3008, which was still way smaller than Passat, but we fit our luggage there (carrying one of the bags on the back seat). I hate when companies offer something which they cannot provide. I booked my trip ~1 month in advance, so they had enough time to prepare themselves. On a good side: the car I got was almost brand new - just 300 miles on its meter and it was very well equipped.