Take a Look at Wing’s Auto-Loading Drone Delivery System – CNET

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 to the left helps orient it properly in the autoloader. Its hollow design, resembling a whiffle ball, keeps the hook trailing the drone after dropoff so it can be reeled in gradually without interfering with the propellers.