This work resumes and continues what has been done previously about the design of the Pacci drone. Pacci is the result of a project started in April 2022, it is an autonomous delivery robot, dealing with the last-mile delivery, which is the last segment of the path, it is the one in which many and different problems have been encountered. In this work all the main researches about this topic and the problems that have been examined are collected and reported, since these constituted the starting point of the initial stages of design of the ground drone. Particular attention has been dedicated to the themes of sustainability, inclusivity and safety.