A groady old backpack with a neoprene sleeve, then nobody will think you have anything valuable 
I have the apple case on mine so I just slip it in next to my 13" MBP in its incase messenger bag style case thingy, dunno the model but there is exactly enough room for the MBP + iPad.
I have not yet decided how I will carry it alone as I don't actually expect to do that. I would look at messenger style bags with handles like a priefcase kinda, with room for some extras like papers and cables.
I have the apple case on mine so I just slip it in next to my 13" MBP in its incase messenger bag style case thingy, dunno the model but there is exactly enough room for the MBP + iPad.
I have not yet decided how I will carry it alone as I don't actually expect to do that. I would look at messenger style bags with handles like a priefcase kinda, with room for some extras like papers and cables.