I just realized that the URL I listed in my original post was not the correct one, and hence your question.
Here is the correct link to info on the Hyperlight:
FYI the seam failed due to poor stitching near the top of the pack, only about 2 inches. GG sent me a small piece of material and my friend (a MYOG backpacker) sewed it on inside of the whole collar as a much stronger reinforcement. It worked well on my one and only maiden trip with this pack.
Let me know if you have anymore questions.