The Kriega R20 backpack fits my 15" MacBook Pro perfectly, along with
. The 13.3'' ~ 14'' model fits a 15" MacBook pro. The backpack is super comfortable, and I can also toss in a spare visor, a change of clothes, and a sealed coffee mug if need be. It's super handy and was a pretty inexpensive solution.
That said, I'd rather have it all in a side bag.