You obviously don't have kids. WE have a collection of perfectly good daypacks the kids used to take their books to and from school. Great for short hikes, and even on an airplane.

And I bet you could pick one up at a thrift shop for under ten bucks.
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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