I bought this for my wife (I know, romance eh?) which is USB A outputs but USB C / micro USB charging inputs. It should see you right for 2-3 days.
Deal of the day: Anker Power Bank, 325 Portable Charger (PowerCore Essential 20K) 20000mAh Battery Pack with High-Speed PowerIQ Technology and USB-C (Input Only) for iPhone, Samsung Galaxy, and More https://amzn.eu/d/hAqnpCf
If you wanted ipad charging, I got this, 1.5 times as heavy though. It has USB A and C outputs (where the USB C slot also charges. When I say 'got', it was great until it packed up 11 months later and I got a refund.
Anker Power Bank, PowerCore III Elite 25600 PD 60W Power Delivery Portable Charger for USB C MacBook Air/Pro/Dell XPS, iPad Pro 2020, iPhone 11 Pro/11 /XS Max/X/8, Samsung and More https://amzn.eu/d/0yUEXLS