Crossbody sling that can carry a tablet?

I'm looking for a sling that can work as an airport personal item, and like a day pack when visiting foreign cities. My only problem is that I want to carry around a tablet + keyboard to do office work without having to bring a full backpack. I can get down to 10" x 7" (HP X2 or Lenovo Duet 3), but that's still not easy for slings. Ideally this could be a daily carry in my city and taken on international travel. Any suggestions?