It’s just 2.2 pounds, and its screen is really cool too.

Yes, that is a Lenovo ThinkPad X1 Nano in your laptop bag. You probably just didn’t realize it because the laptop weighs barely two pounds. 

The ThinkPad X1 Nano is officially the lightest ThinkPad ever built. Lenovo said it managed to squeeze the weight out of the Nano by using a combination of carbon fiber and magnesium-aluminum in the die-cast chassis. “New technology and materials” in the keyboard and cooler also shave off some ounces. 
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https://www.pcworld.com/article/3583968/lenovo-thinkpad-x1-nano-is-the-lightest-thinkpad-ever-built.html