This is the answer. Shrinkflation happens all the time, with bigger sizes being reintroduced at the top, and apparently it's executed well enough for people not

This is the answer. Shrinkflation happens all the time, with bigger sizes being reintroduced at the top, and apparently it's executed well enough for people not to notice, since this is the first comment I've seen that acknowledges it. There is a great analog in sound: the Shepard tone, a.k.a. the "sonic barber pole": https://www.youtube.com/watch?v=u9VMfdG873E https://www.youtube.com/watch?v=u9VMfdG873E To your ear, the pitch constantly descends, yet it can go on infinitely without ever actually getting "low".