Are portable solar panels effective?

Can you strap a solar panel to your hiking bag and charge your phone while gallivanting through glorious nature?

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Intro Screen Music Credit:
Title: Laszlo - Supernova
Video Link: https://www.youtube.com/watch?v=PKfxmFU3lWY
iTunes Download Link: https://itunes.apple.com/us/album/supernova/id936805712
Artist Link: https://soundcloud.com/laszlomusic

Outro Screen Music Credit: Approaching Nirvana - Sugar High http://www.youtube.com/approachingnirvana

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