Finished it last night. Haven't used it yet. I made mine out of sil-nylon and it weighs 2.5 ounces. There's nothing to this pack. The pack I've been using is a GG Mariposa which has tons of structure by comparison.
The design of this pack seems very well thought out. This is a great first time sewing project. My first project was a minima vest which I finished 2 days ago and that was much more difficult. In comparing it to my Golite Ion, this has quite a bit more room.