The Powerfilm 30 Watt Foldable Solar Charger (F15 – 1800), folds into a rectangle that is less than 11 in. x 10 in. It produces 1.8 Amps at 15.4 Volts and can easily fit into a backpack for lightweight compact transportation.         F15 - 1800 30 Watt Foldable Technical Data Sheet (PDF Download)