Although this type of packaging is not required on food packages, many food companies have voluntarily used tamper evident indicators or freshness seals for a variety of food packages. Packages with missing or damaged freshness seals should be discarded. Products that use inner membranes include dairy products, snack foods, and ketchup bottles. Products that use tear away rings include cottage cheese and milk. When the cap is twisted off, the plastic band will break away from the base of the cap and remain on the neck of the bottle to indicate that the bottle has been opened.
Products using break away rings include carbonated beverage bottles and salad dressing bottles.
Products using pop up button caps include baby food and mushroom jars. Products using shrink bands include peanut butter jars and pancake syrup bottles.