Many containers and cartons of volume are measured in milliliters; a
teaspoon is traditionally 5mL, so as a unit to measure capacity: yes,
they are good.
However, in a 2 liter bottle (common size) there are
2000/5 = 400 teaspoons. While this is easy enough to write on the label -
indeed, soft drink cans are often 355 ml, so there is no real
difference bar that of unit - it is extremely difficult to measure out
400 teaspoons accurately. As a way to fill that capacity (i.e. "measure
it out"): no, they are terrible. Hope this Helps! :D
