Several people have asked me if I would make them a pack with a carbon fiber tubing frame, like the one I made for my wife, described in this thread. I have made several for me, one for a friend and one for my wife but I'm not interested in making them for profit. I'm pleased to see that the Z Packs Exo Backpack has a similar frame, however, and suggest you consider it if you have interest in this framing concept.
I don't have any hands on experience with the Exo Backpack but, from the photo and specs the frame looks similar to the ones I have made and the pack's specs (weight and volume) are very close to the one I made for my wife.
I've had very good luck with these frames and with 3 of us using them over the last few years there has not been a single frame failure. The frame adds less than 2 ounces to the overall weight of the backpack.