I packed:
-Tool Box
-Electric Air Compressor
-Racing shoes, suit, helmet and gloves
-Gear bag
-4 track wheels and tires
-Suspension Parts
-Camera Gear
-Mechanics Gloves and knee pads
Still had room for more stuff
btw i have a cusco rear strut, there would be even more space with out it lol. Of course i covered it with painters tape to avoid scratching it.