For something a bit smaller, there's the Klarus EC20 USB-C rechargeable LED flashlight.
Two versions exist. One with a built-in power bank option for $32.oo from Battery Junction. One without that option for $20.oo
Both versions look the same on the outside, so be careful if you decide to order one. Considering the size, guessing it's more along the lines of a very portable emergency power bank for charging up a cellphone. Something like a lip-stick tube power bank charger. I EDC one of those in my work bag. From a completely dead phone battery, I can get 33% charge on my phone; if the lip-stick tube is fully charged.
Not ideal. But the emphasis is on portability. Quite frankly, if I didn't already own a lip-stick tube power bank charger, I'd buy the EC20.