Have you looked at the Lenovo Duet Chrome OS tablet? I have one and it's great. Runs Linux and Android programs quite well, very portable (516 grams/1.14 pounds) an 11 inch screen, and battery life is great since it has an ARM processor. Comes with an attachable keyboard and kickstand in the box too.
https://www.lenovo.com/us/en/p/laptops/lenovo/lenovo-edu-chr...