This phrase typically refers to the quantity of a particular substance contained within a resealable plastic bag, commonly known as a zip-top bag or a Ziploc bag (a trademarked name). The specific amount depends on the size of the bag and the nature of the contents. For example, a snack-sized bag might hold a few ounces of chips, while a larger freezer bag could contain several pounds of frozen vegetables.
Understanding bag capacity is crucial for various applications. In cooking and baking, it ensures correct ingredient proportions. In storage, it helps organize and preserve food items efficiently. Historically, before standardized packaging, loose goods were often sold by weight or volume. The advent of the resealable bag provided a convenient, pre-portioned alternative. This innovation contributed to portion control and reduced food waste, as well as enabling easy storage and transport.