As one of its daily deals, Groupon offers a selection of Powerbag with Built-in Battery System Bags from $45 with free shipping as listed below. That's the lowest total price we could find for these bags by at least $16, although we saw them for $10 to $16 less on Black Friday. They each feature a built-in Apple, micro- and mini-USB connectors, as well as a female USB port. Deal ends December 13. The bags:

• Powerbag Sling with Built in Battery System and USB port in Red (pictured) for $45
• Powerbag Backpack with Built in Battery System and USB port (2 colors) for $45
• Powerbag Messenger with Built in Battery System and USB port (2 colors) for $45
• Powerbag Wheeled Briefcase with Built in Battery System and USB port in Gray for $85