Maybe you can look at this one ：Luxtude 13400mah power bank http://amzn.to/2uf6JJH
IP67 Waterproof & Dustproof--It is the same level as iPhone 7, for ensuring to be used+ normally in any outdoor environment(jungles, rivers, Desert etc.).
Durable, Shockproof and Portable Design--It passed the professional drop test, which could even be used to protect yourself when confronted with danger. But it's lighter.
Top Class LG Battery--It could charge phones repeatedly with 13400 mAh capacity, such as iPhone7 5 times, iPhone6s 5.5 times and Huawei P9 3 times.
Smart Output/Input Quick Charge--It supports max 5V 2.4A output charging and charging 2 devices at the same time. And it also supports max 18W input charging, which could be fully charged in 4.5h fastest. Save your time maximally.
Compatible Well with 99% Smart Devices--Liberating you from various battery of devices when you go out.