Bought this storage compartment.

Bought this Surophy SP-Trunk-US on Amazon. Used it a few times already and it works great. Has two compartments to keep items hot or cold. Like that it's portable and has various storage options. Well made and sturdy for transporting items. I keep it stored under the tray near the subwoofer. I highly recommend this product plus it matches with my passport color and looks nice inside. You can use all four compartments all at once across the rear of the passport.