Many firms which package their products while they are hot know that their packages will appear to be significantly less than full after the product cools. These firms often place the notice "contents sold by weight, not volume" on their packages in order to avoid charges of deceptive:

Question

Quizplus · Accepted Answer

The notice "contents sold by weight, not volume" suggests that the package may appear less full, but the weight of the product is still accurate. This helps avoid charges of deceptive packaging which could occur if the product appears to be full but only contains a small amount.

Many Firms Which Package Their Products While They Are Hot