A modius is a Biblical unit of measurement equal to about a peck (7.7 quarts) or 8.5 liters.

The word modius is used in reference to a basket or bowl, much as a bushel basket is both a quantity and the actual basket itself.

Jesus tells us not to hide our light under a "bushel" or bowl in some newer translations.  This is the word modius.  Ironically, the measurement is not equal to a bushel but instead translated in reference to the basket of that size.