Modify
I replaced the shoulder straps on my GoLite Breeze, to narrower and shaped shoulder straps using the shoulder straps made for my Metolius Rope Ranger rope bag, a mountainclimbing approach rope bag, and Metolius has made the shoulder straps available separately.
Modifying an existing pack may be desired, however there are so many lightweight and ultralightweight packs to choose from now, as well as custom-builders of lightweight and ultralightweight packs, there is more likely to be a pack that has a "just right" fit off-the-shelf.
This fitting guide is the right start.
The best fitting I have had, first, the pack was fit empty, and next, the pack was loaded to maximum weight carried, by me, and small adjustments made.
The overall fit and the small adjustments make the fit.
If purchases do not meet your criteria, consider D.I.Y. (Do It Yourself) or M.Y.O.G. (Make Your Own Gear) or having gear custom made-to-order. There are some links I have provided that offer custom work.
I will be adding D.I.Y. and M.Y.O.G. links and materials sources in a new section.
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