Charge up you phone with negative, antimatter electrons and convert your mobile device to an anti-gravity unit, thus lessening weight. The only downside is that the battery might leak anti-matter that would interact with the normal matter surrounding it and cause the destruction of the hiker and whatever mountain they were currently on. But, we all have to deal with trade-offs in life, every day!
https://en.wikipedia.org/wiki/Gravit..._of_antimatter