Just like amazon, google has also been looking into the idea of using drones to delivery parcels however they are taking a slightly differant approach of using fixed wing planes instead of multirotors. Or rather a hybrid of the two, it looks abit like the quadshot. Here is a video showing the drone delivery some dog snacks.
Overall I tend to think having the fixed wing/ hybrid concept is a little better as it will be able to travel larger distances more efficiently than a quadcopter. I also like their delivery system by dropping the parcel on a tether which is cooler unless the dog gets abit to excited and decides its a game
If you want to read more there is a full article about it here