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There are always the big kahuna options, like Cilogear and McHale... if you don't mind the price tag.
Also, I carried around 30 pounds in a Windrider (2010 model) when I climbed Kilimanjaro, and it carried a lot better than I expected it to, for being a frameless pack. My McHale felt like luxury when I put it back on after that, but since that was a very expensive custom pack, that's to be expected.
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