The good news is that it fits my 15" MBP perfectly. Snug, but not too snug that I worry about scratching due to a tight zipper etc. Feels and looks great and the polyurethane memory foam is spongey but HARD spongey. I am confident this will protect my MBP from scratches and bumps/short falls. The bad news is that I thought it would fit in the Incase 17" nylon backpack but it is too damn tight. Without the sleeve the computer feels a little too loose for my comfort level. That said, I AM going through that OCD stage with it being new. Options are as follows: 1) Use the sleeve when I don't have to carry much else. This is a viable option with such long battery life and a zipper for small stuff 2) Use the backpack when I have to carry books, ext HD, camera, etc. This whole setup was bought for school and the days will be much greater where I will need to carry the backpack 3) Return the backpack and look for another kind that will fit 15" MBP while inside ZS-111. Am really looking for suggestions as far as backpacks that have dedicated laptop protection and will fit 17" laptop loosely or 18", if they make such things.