Anything from a child seat to extra passengers to carrying an extra set of wheels and tires (all four will fit - 2 in the hatch and 2 in the passenger seat). The back seat folds down to make a longer area also. I can fit a trunk, a couple of carry-on bags, and whatever camping gear i need in the summer. Heck, I even carried my na bumper inside the hatch with a passenger on board.