This Anker USB-C power bank solved my biggest problem with portable chargers, and it's 20% off right now

Anker 647 Charging Station Review: Retractable USB-C Charging Heaven

PowerCore III Sense 20K is a slim and powerful portable 20000mAh battery. With two USB-A PowerIQ outputs for dual-device charging and one USB-C PD input for extremely quick recharging. On top of its charging power, you can keep a stylish and professional look with the fabric exterior. This is all you need in a charging companion.

Anker PowerCore III Sense 20K

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