Some more thoughts on the Black Diamond Alpine Start vs. Rab Alpine Jacket.
The length of both jackets is okay for use with a backpack. In the front, they are just about the same length, but in the rear, the Rab has a drop tail which makes it about 3" longer.
My hipbelt just covers the bottom of the zipper of the hand pockets of the Rab. I wish the pockets were just about 1 inch higher.
The Rab has a lot of extra fabric in the stomach area, and when I sit down, or I fasten my pack's hip belt, the stomach area balloons out.
The Black Diamond has a much cleaner front, having only a single chest pocket. The pocket is okay-sized, but not large enough for gloves.
The hood on the Rab is brilliant. The hood on the Black Diamond rubs your forehead when you turn your head.
If you are going to use the hood a lot, or like walking with your hands in your pockets, I would suggest the Rab. If you rarely use a hood, and prefer a clean front, the Black Diamond would be better.