Anyone had some trouble finding a good variety of laptop bags for 13 inch macs? I ordered a crumpler, but it only comes in 12 and 15. Is it bad for the 13inch to travel in the 15 inch case? or is it worse to stick into the 12 inch, though I doubt it would fit. any insight would be much appreciated. I have scoured the internet looking for good options for the laptop case I need, and crumpler seemed to be the best fit. I would hate to do any damage to the mac because its traveling in a case that doesn't fit well.