In reply to FreeloaderJoe:
I think you need to be realistic about several things.
firstly, it's very lightweight and so it's not going to be durable. If you wear a rucksac over it is going to stress the seams and they're bound to suffer.
Secondly, the down is in a series of tubes effectively and it will move along those. It doesn't take much to cajole the stuff into place, but if the jacket is then stored compressed then it's never going to recover well and will lose its loft.
As far as feathers poking out, you're bound to get some, and if you looked after it a bit then you'd even the down distribution out and most of them would pop back in.