How about the PowerPack 20000, 20,000mAh, 72 Wh and weighs less than 1 lb, about 400g.
It has an aluminum shell, so not plastic.
It has Usb power delivery and quick charge 3.0 support and can charge pretty much anything from laptops, tablets, phones, bluetooth headphones, action cameras, drones, etc. It also has a USB Hub mode for connecting peripherals to your laptop and data transfer.
The fact that it is Qi and has a built in cable for charging (but, alas, the very small lightning adapter is separate so is subject to loss) looks as if it will be great when traveling. Can charge it up on the plane without having to carry lots of extra cables (except that small lightning adapter), and can just leave my phone on it in the hotel at night seems very attractive.
it's a Singapore Company.
i bought it when i transit on Singapore Changi airport for SGD $90 or about USD$70
i just bought it last month so far so good,
light weight 8000mah and slim
the most interesting thing about this powerbank is
-wireless Qi 7,5 watt
-USB-C PD 18 watt output and input
so i can charge my iphone x fast using the usb-C or when i want to use it as a wireless charging dock, i just put it on my bed side.