Asus' ZenPower family of external power packs has been around since last November, and it currently consists of the following: ZenPower, ZenPower Pro, ZenPower Combo, and ZenPower Ultra. They have capacities between 9,600 mAh and 20,100 mAh, but the new ZenPower Max debuts with no less than 26,800 mAh.
Thanks to its generous capacity and multiple ports, the ZenPower Max can simultaneously charge tablets, smartphones, and notebooks. However, its size has been kept in check, and the result is a compact accessory that can be easily carried around. Its features include one USB Type-C port and two Quick Charge 2.0 USB ports that allow it to give an average notebook a full charge in around 5.5 hours. At last, it integrates a LED flashlight with a 12-hour autonomy as well. The total power output is 60 W.
Although there is no information about its international availability yet, its price in Taiwan is around $160 USD at current exchange rate. Considering its capacity and features, this sounds like a very good deal.
Source(s)
Chongdiantou (translated)