A good USB-C battery pack uses Type-C ports for both input and output.

The best USB-C battery pack / power bank for phones and tablets: Tronsmart Presto 10400mAh Type-C Battery Pack (small size, enough power to charge tow-three devices, compliant with USB-C)

The best USB-C battery pack / power bank for USB-C laptops: Anker PowerCore+ 26800 PD Battery Pack and Charger (30 W power output)
 

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