27 CFR § 27.61
Containers of distilled spirits to bear closures
April 24, 2020
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.
(Sec. 454, Pub. L. 98-369, 98 Stat. 494 (26 U.S.C. 5301))
[T.D. ATF-206, 50 FR 23955, June 7, 1985]