At just 989 grams, the Tiger Lake-powered Dynabook X30W-J is over 300 grams lighter than the Dell XPS 13 2-in-1 or 200 grams lighter than the LG Gram 14 convertible.
https://www.notebookcheck.net/Super-light-Dynabook-Portege-X30W-J-is-now-an-Intel-Evo-laptop-with-Tiger-Lake-Core-i5-i7-and-Iris-Xe-graphics.503639.0.html