It looks like your Fit is another Cardis. It's 10 inches shorter in length than the current Toyota Matrix, 1 inch shorter in height, and 2 inches narrower, yet it has 4 more cu. ft. cargo space than the Matrix with the back seats up, and 10 more with the back seats down. The passenger volume (which is with the back seats up) is 3.5 cu. ft. less than the Matrix, but that's a simple trade-off and still doesn't explain how a car that much smaller has as much or more space inside.

Good choice!