27 C.F.R. § 41.73

Before removal subject to internal revenue tax, every package of cigars, except as provided in § 41.75, shall have adequately imprinted on it, or on a label securely affixed to it—

(a) The designation “cigars”;

(b) The quantity of cigars contained in the package; and

(c) For small cigars, the classification of the product for tax purposes (i.e., either “small” or “little”).