Our USB backpack fits most of Power Banks. There is a point is that most power banks require to push a button to power on. And you need to reach your backpack, then open your power bank and charge your phone.
So a power bank require no button push to power on will be more convenient.
I'm confused why there's a power port. If
you have a power bank, you can just connect the power bank directly to your device. Why do you need the backpack port? If I'm wrong and the port has a purpose, how do I change the port? Thank you!