This is the backpack that has a 6,000 mAh portable battery pack integrated into the strap, providing easy on-the-go charging while walking. Located within the backpack’s interior, the battery connects to an external USB power port integrated into the front of the left strap. A smartphone’s charging cable plugs into the USB power port. The battery can be charged via the strap port or directly inside the backpack using the included microUSB cable/AC adapter. Providing 1-amp charging, it provides 40 hours of battery life for a smartphone (10 hours for a tablet), accommodates a 17" laptop,and has a padded, reinforced bottom that keeps the backpack upright. 18" H x 16" W x 5 1/2" D. (3 1/2 lbs.)