It can charge up to 3 devices at once.
Energi Backpack: A lightweight backpack, which uses Lithium-ion batteries found in most portable devices. Those batteries output a 5V USB charge that is used to charge most portable electronics. It's a portable charging station.
It can charge a smartphone four times, or a typical tablet to one full charge.
Actual Laptop sleeve dimensions are 13.5 in x 11 in x 1.75 in, but it will accommodate larger laptops as the top of the laptop sleeve has an open end and adjustable security strap.
The backpack and battery together weigh about 4.5 pounds (2 kg).
The battery will generate heat when charging, but it only gets warm. The battery was placed in the middle of the backpack so you will never feel the warmth.
It is designed to charge tablets, smartphones, music players and other mobile devices.
The battery will stay charged for at least 6 months.
The backpack will stand when set on a flat surface.
The Pass thru ports on the left and right side of the bag allow you to walk/text and charge your phone at the same time.
It features 10 Zippered Pockets, 5 elastic pockets, key loop and pen holder.