Gleaning energy while backpacking has never been efficient, but the concept design The North Face SunUp Solar Backpack would make it so. This articulating solar backpack combines amorphous panels with rigid ones on the top of a backpack. While the former are typically inefficient, the latter are less durable. Rather than dealing with those issues, the SunUp backpack has efficient panels made of a flexible thin film. This device consists of many connected panels that connected with conductive hinges, sitting atop the solar panel bag. This comes with two benefits: they’re more durable, and they provide you with more surface area. Though it’s just a concept design for now, this backpacking backpack charges its 4,000-mAh battery in just 12 hours. So after a complete day of hiking on a sunny day, you’ll have enough power to recharge your device.