The sCharger-5 (S5) is a great personal compact solar charger but is also a life saver in emergencies.
The S5 is the official solar charger on the PCT (Pacific Crest Trail,CA) because it's marked as an ultralight solar charger, ~7oz’s. The sCharger-5 is extremely durable, reliable and works well for the endurance hiker.
Most likely you have seen many S5’s on the trails. Including the John Muir, Appalachian, Continental Divide and others. The S5 provides the best power to weight ratio in existence.