I wouldn't use the Gita as its too small to be of any practical use, instead id use the Kilo with a 250lb payload capacity All they have to do is make them theft proof and Amazon could use them for deliveries in large city's like London, NY,LA etc.
Kilo is capable of carrying up to 250 pounds and larger pieces of cargo.
But who knows if these will ever come to market as the Gita was supposed to launch Feb 2nd which is still shown on their website.