Ralph Lauren's solar-panel backpack charges your phone in hours, your credit card in seconds

We here at Engadget are in favor of hitting the books from time to time, but we can't have lame gadget-less backpacks hurting our true techie rep. That's why we're excited to see Ralph Lauren outing its first solar-equipped knapsack as part of its RLX sports line. Four solar cells around back harness the sun's power to generate 3.45 watts -- completely juicing up an iPhone in a purported...