I've been using my iPad for two years with no case or sleeve or anything and it's fine. I don't see why people insist on babying their iPads, waste of money.
In the past, I've always found that wrapping up an iPhone or an iPad like a mummy in a sarcophagus a) gives me bulk/weight and makes me unhappy, b) ultimately makes my buyer on Craigslist happy.
I'm going naked this time. I'm tired of keeping devices pristine for the person who winds up with it next.
BJ