Lots!
My wife and I take weekend trips up to 800 miles each way. We each pack a soft sided bag, then she gets a 2nd one filled. Then one small roll-around. It all fits between the front and back baggage compartments.
Last summer I took my -8 from Texas to Wyoming backpacking. I took the back stick out and loaded my 50+ pound backpack in the back seat and strapped it down really good. Did not even use the rear baggage compartment that time.
Where are you located, Jim? Perhaps there is an -8 near you that you could go see.