Enjoy camping almost as much as you enjoy tweeting about it? Then you’ll probably appreciate FlameStower, the lightest (8 ounces), most compact heat-powered charger that’s graced these pages. Unfold the stand, fill its reservoir with water and stick its blade into a fire to kick its thermoelectric generator into high gear, pumping out electricity at the same rate as your computer’s USB port, i.e. enough to charge most any device – GPS, smartphone, tablet, USB-powered flashlight – in as short of a time as you would at home.

Find it at Amazon – $80