Lightweight case, very long battery runtime, and integrated LTE: You should have a closer look at the Samsung Galaxy Book S if you are looking for a mobile companion and you do not want to rely on public Wi-Fi networks. You should definitely be aware of the limitation to 32-bit apps before you buy the notebook.
https://www.notebookcheck.net/Samsung-s-Galaxy-Book-S-is-a-very-good-mobile-companion-with-integrated-LTE.477253.0.html