Package.
Package. The immediate container in which tobacco products, processed tobacco, or cigarette papers or tubes are put up by the manufacturer and offered for sale or delivery to the ultimate consumer. For purposes of this definition, a container of processed tobacco, the contents of which weigh 10 pounds or less (including any added non-tobacco ingredients or constituents), that is removed within the meaning of this part, for any purpose other than destruction, export, delivery as a sample to a manufacturer of processed tobacco or tobacco products for the purpose of soliciting orders of processed tobacco, or scientific testing or testing of equipment which results in the destruction of the processed tobacco or the return of the processed tobacco to the factory premises, is deemed to be a package offered for sale or delivery to the ultimate consumer. For appropriate tax rate, see 40.25a.
Source
27 CFR § 40.11
Scoping language
When used in this part and in forms prescribed under this part, the following terms shall have the meanings given in this section, unless the context clearly indicates otherwise. Words in the plural form shall include the singular, and vice versa, and words indicating the masculine gender shall include the feminine. The terms includes and including do not exclude things not listed which are in the same general class.