Eco-friendly devices are great, for the fact that they allow us to help the environment, while still enjoying our modern technology. The biggest downside to such gadgets is that they tend to cost a good bit of money, which turns many people off to the idea. Well if you want to do your part, and don’t mind a little bit of DIY work, then you can have yourself a nice little solar USB charger for around half the cost of one you’d get at a store.

This great Instructables guide shows you how you can construct a solar charger for any device that draws power via USB. Not only is it cheap to construct (around $20), but it’s also small enough to fit in your pocket. Sounds like a great little weekend project to me.