I understand some of the limitations, and the instructions (for a non-sewer) need some work.

I will be using it in 2 weeks when I backpack in AZ, including the GC (S.Kaibab and Bright Angel). I plan on a detailed review when I get back. I can already see some changes I would make, like making the tops of the mesh pockets closable with cords like the top of the bag. The pockets are too large, IMO, to keep things in there securely on mountainous trails.
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Life should not be a journey to the grave with the intent of arriving safely in a well preserved body, but to skid in broadside, thoroughly used up, worn out, and loudly proclaiming Wow! What a Ride!