GoSun recently launched the Flow, a solar-powered water purifier that is small enough to fit in a backpack but produces enough clean water to wash your dishes or even take a show.
It's the world's first portable solar-powered purifier yet small enough to fit in a backpack. Instead of manual pumping, a USB-powered pump enables the delivery of water to wherever you need it. For good measure, it includes a power bank that supplies to power the pump but can also run off a mobile phone or be charged directly by a solar charger (like this).
Energy Live News has a rundown of how effectively the Flow does its job:
Not bad for something the size of a small kitchen appliance.