For outdoors, or even for emergencies, it's the solar powered/usb lantern.

Ideal for camping trips, the Solar Lantern/Phone Charger.olar rechargeable, so you never have to worry about running out of batteries on your outdoor trips, (assuming it's sunny!) It can also be charged via USB when you're near power, like at home before you start your outdoor adventure.  Need to make an emergency call but phone battery is dead? The Kizen lantern has an 800 mAh battery, so while it's not enough to fully charge your phone it should have enough power to charge it enough to make a few calls.(That's if you haven't run the battery out with the lantern/flashlight.) Do you have limited backpack space? This lantern folds 2.4x smaller from full size. 3 light modes, high, low, + SOS for emergencies. When folded, it can also be used as a powerful flashlight.

This lantern/flashlight is usually under $20 online.

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