Chris,
I just ordered a Kalais pack so I will let you know how different it is from the SMD Starlite. I have put a lot of miles on my late, lamented, Starlite (I wrote a long review of it on Trailspace). I should be able to make some direct comparisons between the two. The Kalais won't be shipped for about a month though. I just got my JMT permit so the Kalais should be put through the wringer in late-August. I should have the pack in time for my early-May Grand Canyon trip too.
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May I walk in beauty.