Question Help! USB Type-C splitter with double the current

[DimosPlou]

I am looking for a type-c splitter that has 3 or more Amps of power but I can't find any. To explain, I have 2 power banks that each provides 2A (5V each) and I want to somehow combine them into one output Type-C again of 4A. Any help would be much appreciated!
Thanks for your time!

 

[USAFRet]

and I want to somehow combine them into one output Type-C again of 4A

OK..the obvious first question is....Why?