States, the Fair Packaging and Labeling Act provides an important framework for many consumer commodities. The law requires covered products to disclose information including the identity of the commodity, the manufacturer, packer, or distributor, and the net quantity of contents. The Federal Trade Commission explains that the law is intended both to facilitate value comparisons and to prevent unfair or deceptive packaging and labeling. Foods, drugs, cosmetics, and medical devices generally fall under FDA administration of the relevant federal labeling requirements, while the FTC administers the FPLA for many other household consumer commodities.
The law also recognizes that packaging itself can matter, not just the written words on the label. The FPLA authorizes regulations where needed to address matters including slack fill and characterization of package sizes. “Slack fill” generally refers to empty space inside a package, although empty space is not automatically deceptive because it can serve legitimate functions.
Products may need space for protection, machinery requirements, settling, or other functional reasons. The legal analysis therefore involves more than simply measuring whether a container is filled completely to the top.
Historical FTC decisions illustrate why package size can matter even when quantity information is technically present. The Commission has addressed situations in which oversized or deceptively shaped containers could create misleading impressions about the amount of product inside. In one historic decision involving gift-wrap packaging, the FTC concluded that an accurate quantity statement did not necessarily cure a misleading impression created by the container itself. That decision belongs to a particular factual and legal context, but it demonstrates a broader consumer-protection principle: the overall presentation can matter alongside literal wording.
This is an important distinction when discussing packaging responsibly. It would be inaccurate to say that any container containing empty space is automatically illegal. It would also be inaccurate
to assume that printing the correct net quantity always makes every possible package design acceptable. Regulations recognize both the practical realities of packaging and the possibility that design can mislead. Specific products need to be evaluated under the rules that actually apply to them. General online discussions should therefore avoid making accusations about particular companies without evidence.
Net quantity remains one of the most reliable pieces of information available to shoppers. In the United States, covered consumer packages must provide quantity information in appropriate units. NIST develops guidance relating to packaging, labeling, net contents, and weights and measures. Its materials are used by regulators, retailers, industry participants, and others seeking more uniform measurement practices. These systems exist because visual impressions alone are not precise enough for commercial measurement.
Unit pricing can make comparison even easier. Instead of focusing only on the total shelf price, a unit price expresses the cost
