You don't even need to redesign (resize) the packages (boxes, think laundry detergent or cereal). Just fill them up with 5-10% less and only change the printed

You don't even need to redesign (resize) the packages (boxes, think laundry detergent or cereal). Just fill them up with 5-10% less and only change the printed weight/volume. If the package doesn't transparently show the product inside it's not as obvious.