DJI Ryze TELLO is a popular drone but you might need some other components to fly better and take photos or record videos. Good choice if you use a wifi range extender like the Xiaomi MI WiFi powered by a power bank.
Carrying the devices and controlling the flying during a walk may be problematic. This holder helps you to fixing power bank on the gamepad and you may hang it into your neck.
I also uploaded two separeted STL parts: the GameSir hanger and the power bank holder.
If you have another type of power bank just resize the holder and merge with the hanger.