Yea I got me one after I got a Macbook Pro M1 for work a couple of (~3) years ago. The name it goes by is “POWERBANK PLUS MACBOOK 20.100 MAH SILVER XLAYER”. But the battery life of the M1 MBP is just good enough that I only needed it once to charge the laptop, in all that time. Smartphone (iPhone 12 Mini) is the much much much larger problem. :)
Both are terrible options, flip a coin.