SP3 Cases?

Does anyone have good recommendations for an SP3 case? I'm more interested in cosmetic protection from scratches and scuffs. A pocket to carry small things (pen, HDMI connector, flash drive, etc.) would be nice as well.

Right now, I'm just using an old MacBook AIr 13 case, which works alright, but the dimensions aren't perfect and it slides around inside. I'm interested if anyone has found a good sleeve case.