Take the Soul Cell Solar Powered Lantern with you to light up your campsite. A pocket-sized collapsible lantern, the Soul Cell is great for off-the-grid illumination. Although it’s still a concept, this handy little invention would hook perfectly onto your backpack and it wouldn’t take up a lot of room when packed away. It would also be great to hang in a tent, thanks to its strap that is attached by magnets. Jesper Jonsson.