The total bandwidth of USB3 using UAS (requires a modern USB3/SATA bridge like JMS567/JMS578 that have good Linux support) is about 390MB/s with a single SSD. With two devices on the USB3 host port a bit less due to overhead.
The maximum current you can draw from the USB3 port is about 900mA which will not be enough for both the SSD and the card reader, so the SSD needs some external 5V supply (probably from your powerbank) or you use a powered hub that you supply from the power bank. Be aware that the powered hub might also have a 900mA/port limitation and some SSDs need more than that, in which case you need a USB3/SATA adapter that has an external 5V input...
The maximum current you can draw from the USB3 port is about 900mA which will not be enough for both the SSD and the card reader, so the SSD needs some external 5V supply (probably from your powerbank) or you use a powered hub that you supply from the power bank. Be aware that the powered hub might also have a 900mA/port limitation and some SSDs need more than that, in which case you need a USB3/SATA adapter that has an external 5V input...
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