Another Change in Product Sizing

We had always bought Dairyland chocolate milk when it was on sale at Walmart for $1. It was as far as we had known, always 1 litre size. Now we have noticed the carton size "looks" the same, but inside contents are less. 

Seen here- the 1 litre white milk carton and the same carton with less fluids now in it for the sale price of $1 is "used to be".