No person shall transport, buy, possess, or sell, or transfer any imported distilled spirits in containers of 1 gallon (3.785 liters) or less, unless the immediate container thereof has a closure or other device affixed in accordance with the provisions of this part.
27 C.F.R. § 27.61
Sec. 454, Pub. L. 98-369, 98 Stat. 494 ( 26 U.S.C. 5301 )