Answer
The USB Type-C Power Delivery (PD) design is here to improve the portability of modern laptops, it allows portable power banks to provide extra power for the laptop's battery on the go.
To find a suitable USB type-c power bank, visit MSI website to check the specification of the bundled power adapter under the product specification page.
Power banks with the Power Delivery (PD) maximum power output (wattage) that "equals" or is "higher" than the bundled AC adapter would work without problem. (Power banks that have PD certified, or power charging protection design is a plus)
*Note: Be careful that some maximum power output for the power bank would be limited with a certain amount of connection at once, check with the power bank vendor for details.
MSI Laptops that are bundled with a power adapter higher than 100W (e.g. 150W, 180W, 280W, 330W...etc.), choose the maximum 100W PD power bank as the backup power source for the battery.
Refer to [Product Information] USB Type-C Power Delivery (PD) on Gaming & Content Creation Series Laptops for more information.
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[Product Information] USB Type-C Port
[Product Information] USB Type-C Power Delivery (PD) on Gaming & Content Creation Series Laptops