Regardless of whether a package is packaged prior to the time of sale or at the time of sale the packaging material is called TARE. Smart shoppers can save money if they understand and use the following "Tare Tips".
When buying products, take the time to compare the net weight found on the label of the package to the total weight. You can ask the butcher to weigh the product. The price you pay should reflect the net weight. If the package weighs the same or less than the net weight, you are paying for the packaging and NOT just the product.
For Example:
Don't be fooled when buying poultry, meat or seafood. Arizona law requires these items be sold by weight unless they are sold in a standard package.
A standard package is part of a lot, shipment or delivery of packages of the same commodity with identical net contents declarations. If sold by count, each item must be of equal weight. A random package is a package that is one of a lot, shipment or delivery of packages that do not have a set pattern of weights.
To check the weight of the products you're buying and to make sure you're not paying for the packaging, follow these simple guidelines:
Step 1
Take the package to a deli or meat scale. If the scale has a "Not Legal For Trade" notice on it, it is an estimating scale and may not record the product weight accurately.
Step 2
Place the package on the scale. Make sure the scale weight is more than the net weight shown on the label. If the package weighs the same or less than the net weight, YOU ARE PAYING TOO MUCH and you should have the store reweigh the contents. Note: If you want to sound really official, tell them to take out the tare weight (that's the packaging material weight. You should never pay for packaging).
To learn more about how the Division conducts packaging inspections, see NIST Handbook 133.
To learn more about meat, seafood and poultry legal method of sale requirements see NIST Handbook 130 1.5.