I see this picture all the time, but there's no measurements whatsoever

I would love to make these for my friends one day, but there's like. No measurements. Would anyone be able to help me out?

https://preview.redd.it/c1g22f5ungfh1.png?width=1290&format=png&auto=webp&s=393629b786d588f173a0133636722861aa351498