Your next battery pack should have USB-C, and this massive 30,000 mAh pack from Aukey obliges you with a USB-C input/output port, two standard USB ports (one of which includes Quick Charge 3.0), and an extra microUSB input in case you misplace your USB-C cable.
It doesn’t have USB-C Power Delivery (unsurprising at this price), so it won’t charge a MacBook or Switch at full speed, but its 5V/3A output is still faster than standard USB.