EasyAcc metal 5000mAh External Battery Ultra-Slim Power Bank Portable Charger for Smartphones - Black (Wireless Phone Accessory)
Well it's definitely times slimmer than PowerBank 10,000 mAh. However, as lean and not now. I'm now a few weeks, holds actually pretty good, also good to invite. Size: slightly larger than an iPhone 5 and slightly thicker. But fits well in the pocket