Maybe I missed it in the responses, but a shot of espresso is also far SMALLER than a cup of drip.
[By the numbers from the Mayo Clinic](https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/caffeine/art-20049372), a cup of drip with 96mg of caffeine is 8 ounces, while the espresso (64mg in their chart) is 1 ounce.
To directly compare,
1 ounce espresso: 64 mg
1 ounce drip: 12 mg
8 ounces drip: 96 mg
8 ounces espresso: 512 mg
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