I agree about protecting that exposed speaker in the trunk. It is the most unpolished part of the car.
Just a heads up. That big exposed speaker in the trunk is the sub-woofer and it has a huge magnet at its base. If you were to stuff the trunk, and put your laptop bag on top and push it back under this 'exposed' magnet, GOODBYE HARD DISK. Same would hold true for a carry on bag with credit cards, or anything else with a magnetic stripe. Just be careful.
