LISEN Ultra Slim Metallic Magsafe Power Bank 5000mAh $34.99 + Delivery ($0 with Prime/ $59 Spend) @ Lisen Space via Amazon AU

This is the slimmest power bank I have ever seen measuring at 0.7CM thick.

Works on all MagSafe iPhones 15/14/13/12 series but if you have a case your case needs to be MagSafe as well. If you have a normal plastic case it wont work and wont magnetically stick.