Check out Wing’s self-charging drone delivery system

Wing delivery drones pick up packages with a lightweight hook called a “pill” after its shape. The rounded bottom stops the hook from re-grabbing a package after delivery. The triangular protrusion on the left helps to orient correctly in the autoloader. Its hollow design, resembling a spinning ball, keeps the hook to pull the drone after falling, so that it can be rolled up gradually without interfering with the propellers.