Tylt Energi Pro backpack review: Would you like a bag with your battery?

Tylt's excellent Energi Pro backpack comes with a 20,100mAh portable battery, 12 zippers, and one of the most comfortable set of straps I've ever worn. I have a bag problem. It started years ago when I was looking for a decent messenger back to sling across my shoulders while talking through the city, but since then it's extended to backpacks, too. I am constantly searching for the perfect combination of design, comfort, space and features, and with the Tylt Energi Pro I think I've found it. See...