27 C.F.R. § 40.216a

(a) Product designation. Every package of pipe tobacco shall, before removal subject to tax, have adequately imprinted thereon, or on a label securely affixed thereto, the designation “pipe tobacco.”

(b) Product weight. Every package of pipe tobacco shall, before removal subject to tax, have adequately imprinted thereon, or on a label securely affixed thereto, a clear statement of the actual pounds and ounces of the product contained therein.