Minimal iPad Air 2 Case
If you want a minimal iPad Air 2 case that doesn't add bulkand lets the color show through this clear iPad Air 2 case from KAYSCASE is a nice option.
This plastic case snaps onto the iPad Air 2 to add some protection from drops and daily wear and is compatible with the iPad Air 2 Smart Cover for more protection. There are also other color options avialable.
$9.99 at Amazon