It really depends on the car you are renting. The golden rule is that if you are renting the smallest option you can fit 1-2 medium sized luggage, medium sized options carry 2-3 luggage and the larger options carry 4-5 luggage. This of course also depends on the size and shape of the luggage.
Keep in mind that when you rent a 7 seated vehicle and you have 7 passangers the luggage space is a lot lesser so you only fit around 2-3 medium sized luggages depending on the size of the rental car.
Our 9 seated options however fit 8 luggages – no matter how many passangers!