A mobile robot adapted to deliver temperature-sensitive items to recipients, said robot comprising: a robot body comprising a robot item space; a robot lid adapted to assume at least an open position and a closed position; wherein: the robot lid is adapted to fit on top of the robot body in the closed position, so as to cover the robot item space; and the robot lid is adapted to be lifted to the open position, so as to allow access to the robot item space; characterized in an insulated bag located within the robot item space and comprising: a bag body comprising a body inner surface, a body outer surface and a body cavity configured to receive one or more items for delivery; and a bag lid comprising a lid inner surface and a lid outer surface, the bag lid adapted to fit on top of the bag body in a closed position, and further adapted to be lifted to an open position, so as to allow access to the body cavity; wherein: the bag lid is adapted to assume an open position when the robot lid assumes an open position; and the bag lid is adapted to assume a closed position when the robot lid assumes a closed position; wherein the robot lid comprises a robot lid inner surface; and the insulated bag further comprises a securing element adapted to attach the bag lid to the robot lid inner surface. a robot body comprising a robot item space; a robot lid adapted to assume at least an open position and a closed position; wherein: the robot lid is adapted to fit on top of the robot body in the closed position, so as to cover the robot item space; and the robot lid is adapted to be lifted to the open position, so as to allow access to the robot item space; the robot lid is adapted to fit on top of the robot body in the closed position, so as to cover the robot item space; and the robot lid is adapted to be lifted to the open position, so as to allow access to the robot item space; an insulated bag located within the robot item space and comprising: a bag body comprising a body inner surface, a body outer surface and a body cavity configured to receive one or more items for delivery; and a bag lid comprising a lid inner surface and a lid outer surface, the bag lid adapted to fit on top of the bag body in a closed position, and further adapted to be lifted to an open position, so as to allow access to the body cavity; wherein: the bag lid is adapted to assume an open position when the robot lid assumes an open position; and the bag lid is adapted to assume a closed position when the robot lid assumes a closed position; a bag body comprising a body inner surface, a body outer surface and a body cavity configured to receive one or more items for delivery; and a bag lid comprising a lid inner surface and a lid outer surface, the bag lid adapted to fit on top of the bag body in a closed position, and further adapted to be lifted to an open position, so as to allow access to the body cavity; wherein: the bag lid is adapted to assume an open position when the robot lid assumes an open position; and the bag lid is adapted to assume a closed position when the robot lid assumes a closed position; the bag lid is adapted to assume an open position when the robot lid assumes an open position; and the bag lid is adapted to assume a closed position when the robot lid assumes a closed position; wherein the robot lid comprises a robot lid inner surface; and the insulated bag further comprises a securing element adapted to attach the bag lid to the robot lid inner surface.