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The obvious move is to put them in series. 5+5 = 10V.
What is the resulting A-Hrs? Do we add the two values? (10000 + 10000 ?) This calculation is not so obvious. It is easy to make a mistake if we approach it with our intuitive sense alone. It ought to be done in a way that considers the total picture. So I prefer to convert to Watts, then combine the power banks, then convert back to A-Hrs.
It works on paper. However, to be safe you need to determine what kind of isolation you have. We can't see inside the converters. There is a chance that the power sources (computer, 12 VDC, mains AC, etc.) could find some internal path inside the converters. You might get a short circuit, or ruined components.
Is your power source an expensive computer? Then I would not risk ruining a USB port.
The question is will this interfere with USB communications and what is the coupling of noise from one source to the other in terms of CM noise effects on data and isolation voltage and protection on each output during shutdown to prevent voltage reversal? I would not use this method.
It would make more sense to use 3 LiPo cells and ultra-low drop LDO if you needed exactly 10V or some constant current.
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