Solar backpack for £60

I know, I know - I said I wouldn't do eco product news. But a solar backpack for £60? You know green goods are going commodity when a sun-powered bag comes in at less than half the price of rivals such as Voltaic System's backpack. And has a battery built-in. Of course, you get what you pay for: the bag's not as handsome as its pricier cousins, and I'm guessing the charge times are slower than the Voltaic due to the much smaller solar panel (there are no specs on the bag shop's site).