I recently came across the modius and trimodius measures in Plautus, and became curious about what exactly I should imagine. They’re dry measures, typically of grain, but they are also roughly equivalent to a peck and a bushel (bzw.), so we can illustrate them with apple baskets, since it’s Fall—
Here’s a peck, a.k.a a modius.
Here’s a bushel, which is four pecks (a little more than a trimodius).
Imagine what this basket would look like after the slave helped himself to a few…. that’s a trimodius.