Thank you , Daisy!

We, too, hiked many miles with external frame packs, and never really had an issue with them. We now have internal frame packs, but more because that's what's available these days. And we are carrying 20-35 pounds max...
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Check our our website: http://www.backpackthesierra.com/

Or just read a good mystery novel set in the Sierra; https://www.amazon.com/Danger-Falling-Rocks-Paul-Wagner/dp/0984884963