welcome to the forums
i, too, am thinking of doing the same thing. i dont have a sewing machine and wont by the time i start hiking, plus i'd like to get the feel of working with down before i start making my quilts from scratch.
i am looking at the REI Siesta, its on clearance for less than 50 bucks on rei outlet right now.
a wally world or similar bag would be great too.
i'll post pics soon.