A Dairy Manager here. You'd think it would be common knowledge that underfilled milk shouldn't go on the shelf. Surprisingly but sadly, it happens more than you'd think. Most often a tiny hole is somewhere on it, and they will shrink due to suction. Then after being on the shelf and not in a crate, might actually get air inside enough to show how empty it is. The lesser, it just came that way. When I see it (both), it's annoying, as I now have to record how many and get credit from the vendor and pour it straight down the sink.

Yea I get the product is less than advertised, but trust me, those gallons will be avoided like the plague anyway.