Get this Powerbag 14" 3000mAh Charging Sling Bag (model RFAP-0145F) for $35 at Woot. Shipping is $5. This was the lowest price we found by $35. It has a built-in battery system that charges the average smartphone twice and includes 30-pin Apple, microUSB and miniUSB connectors and a USB port. It's available in blue (pictured), but also in green. Other styles of Powerbags such as roll-aways and messenger bags are also available. Sales tax is not charged in most states.