I've done my research, crunched the numbers, and read other internet websites, and as far as I can tell you can't buy a modern 13.3-inch laptop that weighs less than the new Fujitsu LifeBook U937/P. The laptop weighs 799 grams, which is 1.76 pounds. Lenovo had a 1.72 pound laptop back in 2015, the LaVie Z, but that laptop now starts at 1.87 pounds according to Lenovo's own website, and it's sold out.
Fujitsu is light on details about the U937/P, other than the fact that it comes in black or red, is 15.5mm thick, and has a new Kaby Lake processor inside. But the brand name says it all: Fujitsu makes computers for enterprise, not for wayward millennials like me. For now I'll have to settle for keyboardless tablets if I want the lightest computer money can buy. Or buy a suit.