The Lenovo ThinkPad X1 Nano Gen 1 is the lightest ThinkPad laptop to this day. With a new deal in Lenovo's US store, it is now more affordable than it has ever been before.
https://www.notebookcheck.net/Deal-Clearance-discount-brings-the-featherweight-Lenovo-ThinkPad-X1-Nano-below-the-1-000-mark.530421.0.html