This solar charger is so thin and light it'll fit inside a notepad. Intrigued? Let's take a closer look.
It's called Solar Paper, and as the name suggests, it's incredibly slim. You can slip it into your notebook for travelling, or clip it to your backpack to power up your phone on the go. It's also small – only a little bigger than a £10 note, in fact.
Despite its slim proportions, it'll charge an iPhone 6 in about two and a half hours, which is about the same as from a plug socket.
It's also modular. If you need more power – you want to juice up your tablet, say, or it's a cloudy day – just clip on other magnetic panels. Easy. If you're going out and don't need too much extra power, you can travel light and only take what you need.
It comes in three options. The 5 watt has two panels, the 7.5 watt three panels and the 10 watt has four panels. And it charges any device that has a USB port, including smartphones, tablets, walkie-talkies, torches, portable games consoles, cameras etc.
Some solar chargers have to be manually reset every time the sun goes in, but Solar Paper resets itself – as soon as the sun comes out, it starts charging again. You don't have to lift a finger.
It's passed its funding and will ship in September.