I bought a new iPad case by Poetic for my iPad Air. This one has a “smart cover” which has magnets in it that automatically wake the iPad from sleep mode when you lift the cover, and also puts the iPad to sleep when you close the cover. I’ve been using a similar case that didn’t have the cover, but I honestly should have just gotten this one to begin with. At least they aren’t expensive!
The cover also acts as a stand which is nice for sketching at a comfortable angle. I like it!