Asus Philippines recently expanded their range of powerbanks by going into "slim"
They unveiled the Asus ZenPower Slim which they claim as the world's slimmest powerbank at 8.3 milimeters and weighs only 81 grams. It has 1 regular USB port, 1 micro USB and 3,000 mAh battery.
Asus ZenPower Slim for now is available thru Lazada Philippines for Php 519. If you wish to buy it, better tpo go thru this link