The lightest 10-inch 2-in-1 comes in at just 772 grams (1.7 pounds) including the keyboard. There’s a high-brightness 2K resolution screen, the latest 8-core CPU, 3GB of RAM, it’s waterproof, can run Office, has disk encryption, and should last you all day long. It’s the Sony Xperia Z4 tablet, running Android. I looked at it while I was at MWC and I’m looking at it again now because the first set of reviews are very positive and the prices seem good. It sounds like the dream ultra-mobile PC.