We carry a small and very lightweight daypack when we backpack. It's really just a sack with a couple of shoulder straps. And we not only use it for a day pack--it's great for carrying our water bottles back and forth from camp to lake...and we fill it with clothes for a pillow at night.
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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