The Magic Keyboard with an integrated trackpad looks elegant and lightweight. However, it turns out that there is a good reason why Apple has kept the weight of the case a secret so far; it is damn heavy. So heavy is the Magic Keyboard that it makes the 12.9-inch iPad Pro outweigh the new MacBook Air.
https://www.notebookcheck.net/The-new-Magic-Keyboard-for-the-Apple-iPad-Pro-is-a-real-heavyweight.462280.0.html