It might not be the pack that's too heavy...it could be you!

We need a bit more information before we can give you more advice. Do you walk three times a week for an hour or so? THat would help you get into practice and condition for more hikes...
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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