Use Office Max coupon code GMA
Office Max has this Powerbag Backpack by Ful w/ Battery for $99.99 after instant savings. Use the coupon code to drop the price down to $49.99. It features a 3000mAh lithium polymer battery that can charge your smartphone or tablet and has space for laptops up to 16". Amazon
has this same backpack for $84.99. Shipping is free.