The power bank from Zilutech serves the ultra compact market. At 4,400 mAh of power, it holds enough juice to charge just about anything, once. Yet, it is small enough to fit easily into your pocket or handbag.
Looking quickly at the specs, it measures 3.72 x 1.8 x 0.85 inches. Compare that to the 4.8x2.95x0.95 inches of the Coosh or the 3.15 x 0.87 x 6.3 inches of the INNORI. Weightwise, you're looking at under 3 ounces, a good 5 ounces less than the Coosh, and 12 ounces less than the INNORI. It is really meant to count where size matters most and you don't want to carry too much extra with you.
The Zilu model has a single USB port rated at 5V/2A. Next to the port is a little flashlight, too. In addition to black, it also comes in pink and white. And, it is priced at $14.99 at Amazon.
When size really matters most, the ZiluTech power bank is the way to go. The 4,400 mAh rating should keep you happy, if a charging a device a single charge is good for your needs.
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