For 12.9" this is the best ever: http://forums.imore.com/ipad-pro-12-9-inch/347971-best-cases-ipad-pro-3.html#post2783930
You can carry any keyboard, Apple Pencil and even your wall charger+cable everywhere.
That's for the bigger one, this thread was for the 9.7
That website also seems pretty sketchy IMO
That's for the bigger one, this thread was for the 9.7
That website also seems pretty sketchy IMO