I noticed the change in the size of mayonaise quite a while ago. I know it has at least been over a year since they changed to the smaller size for the mayonaise jars. We were discussing the size of the mayo containers on a thread somewhere on FR a then, but I don’t remember if it was on the cooking thread or not.
Ground coffee is another one that keeps changing to smaller and smaller size containers in terms of ounces.
Opps, you also mentioned the coffee already. I guess I need another cup of it to be able to wake up! LOL!