From Bearded Tesla Guy.

The Cybertruck undersea storage bin has finally started shipping after lengthy backorders. This thing has been hard to catch in stock, and lucky for me, I was able to snag one before it once again sold out. Since this bin tucks nicely underneath the Cybertruck rear seats, it’s added storage in an otherwise wasted space. Despite the hefty price tag of $250, I say this is a must have Cybertruck Accessory!