Kingsons Men New Beam Backpack Solar Panel +USB Charging /Anti-theft/Waterproof/for 15.6 Inch Laptop

Wherever an adapter for a USB cable extension is needed in a backpack. Charging an external device via the solar panel does not seem to work unless a power bank is connected. Even then, the charging function is questionable because the small lamp does not light up when charging due to UV radiation and you cannot use a power supply to find out whether a closed circuit is even working. 2 stars only for good design and lots of space in the backpack!