DarrylW4 did two reviews (one audio, one video) of three models of the PowerBag. Check out these reviews for more on the Sling by ful, Backpack by ful, and Messenger by ful. He also mentioned the three battery options - 3,000mAh, 6,000mAh, and 9,000mAh.

Special thanks to PowerBag for providing the Sling by ful for review. Our thanks to Roastedof Marine City for use of their coffee shop for shooting of the video.