Just wondering if anyone's managed to find a decent sleeve? Ideally with a separate zipped front pocket for charger etc. I've seen a few on Amazon and eBay etc. listed as 'for the 12" retina MacBook', but when looking at the dimensions it's obvious it's made for another device and will be oversized. I'm wanting something really slimline and a tight fit, to make the most of the modest size! Has anyone found anything?