Yeah--we leave enough gear in our van for it to be our "go bag." It includes a bunch of water, some day packs, and enough food for a few days, plus sleeping bags. And we try to leave it with at least half a tank of gas at all times.
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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