Banggood is having a sale! Something I picked up myself at a decent price is this: a 10000mAh Powerbank with wireless charging!
One plus with this, is that the USB-C offers PD18W, meaning you can in some cases also charge a laptop on the go.
You can find out more info from Banggood
Specs from Banggood's website:
Dual USB + Type-C Power Bank + 10W Wireless Charger, charge 4 devices simultaneously.
Fast Charging PD18W, QC3.0, QC2.0, FCP,DCP,Apple 2.4A.
PD18W Type=C Input + 5V/2.4A Micro Input
Reliable Multi-layer Protection
Reassuring Over-charging Protection, Over-charging Recovery Voltage, Over-discharging Protection, Over-discharging Recovery Voltage, Over-current of Discharging, Over-current of Charging, Short-circuit, and Temperature Protection.
Net Weight 225g±5
Material PCBA, Polymer battery
Battery Capacity 10000mAh 37Wh Polymer Battery
Conversion Rate ≧85%
Total Power 18W
Type C/Micro USB Input 5V2A, 9V2A
Outputs USB 1: 5V3A
USB 2: 5V3A,9V2A,12V1.5A
Wireless Charger: 5W/7.5W/10W
Supported Protocols PD18W QC3.0 QC2.0 FCP DCP Apple 2.4A
Working Temperature 0~45℃
Certifications CE, FCC, RoHS