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Actually I have a Z flip 3. It charges wirelessly on the lower half. So need a compact power bank.What is your expectation from the size ?
Do you want it to be fit in Front Pocket of your shirt or Jeans/Trousers pocket ?
Most of the power banks in the market now are of size of 5" phone.
This one is 15cm is length
This one is the size of your palm (deal of the day on Amazon)
Fast charging, is required. Even a wired power bank would do.