I recently bought the Mission Backpack to use in the city and on the mountain. It is a great pack and I would highly recommend it to anyone needing new kit. One fact I could find when researching was whether a 15 inch macbook pro would fit into the laptop sleeve within the pack. I am pleased to say that it does indeed fit (quite adequately in fact). However, it should be noted that if you intend to put your goggles in the goggles/glasses section then the laptop may not fit as well as it otherwise would. Also, the top of the laptop will poke out a little bit - BUT you can fit the laptop in a neoprene case within the Mission backpack - awesome. You'll be truly protected all year around.
So Mac lovers, you can now have the best of both worlds!