Great price on one of the best power banks out there.
20000mAh USB-C 2-way 45W QC3.0 PD Laptop Battery Charger
Large Capacity Premium LiPo Battery: 20000mAh (74Wh) capacity, enough to recharge Xiaomi Mix 2S four times and iPhone 8 seven times.
High Output Capability: Two-way USB-C port at 45W max input/output to fast charge a wide range of USB-C devices. Two additional USB-A ports can output 18W individually or 5V3A (15W) when used together.
Premium Build and Finish: Unibody case design with a smooth surface and ceramic-like top and bottom panels.
Designed with Safety in-mind: Built-in a number of protection mechanisms and integrated circuits to provide stable and highly efficient power output.
I believe this is the cheapest it has been on OzBargain. Usually closer to $50.