The Gear Junkie:
Traveling in Nepal last month, the AdventurerOpti was constantly at my side. The product is small, easy to use and quick: Press the button, dip the lamp into your drink, and wait 90 seconds to purify a liter of liquid.
As a hiker we take water filtration and purification for granted. In the grand scheme of things these little devices are amazing, and hopefully we can get them into the hands of more people who need them on a daily basis.