You’re the guy who cuts the handle off his toothbrush, just to save weight in your backpack, right? But what if you need to take your cell phone along, even if it’s only for emergencies? If that’s the case, you might also want to carry along a solar charger. It’s a lightweight, efficient way to keep your battery charged, and it’s completely environmentally friendly. Choose your next charger based on size and weight, convenience, and whether it includes features like a flashlight.