My 12" iBook is suppose to ship today at latest and I'm wondering what bag I should get to tote it around in. It's hard to tell because I can only look at them online... I was thinking of McBain's LoveChild from Crumpler but I'm not sure. Do I need to get a sleeve in addition to the bag? I don't really undestand what a sleeve is I guess. Also does anybody else have any other recommendations? I looked at timbuk2 and and Santa Cruz but I think I like the Crumpler one the best thus far... thoughts? Or at least clue me into what a sleeve is?