The new ones are only about 20% smaller
than the old ones. I wouldn't have noticed
if I didn't have a few of the cups in my car.
Usually, I finish my coffee in the store, but
occasionally I get out to my car before finishing,
so I accumulate a few empty cups. Today,
I stacked the cups together to throw them away,
and one cup wouldn't fully nest within the others.
I examined the cup below it to see if some foreign
object was getting in the way, but that cup was
empty. Comparing the two cups, I saw the older
cup is larger than the new ones. The difference
is just small enough that I didn't notice until
trying to stack the old and new cups together.

Granted the cups and coffee are free, but it does
seem like a sneaky way to reduce costs -- the sort
of thing I expect from Safeway but not a good store
like Trader Joe's. A store that cares about its
customers and doesn't try to shave a little cost
at every opportunity. I hope this is not a harbinger
of things to come. That would ruin Trader Joe's.