27 CFR § 19.473 - Authorized containers.
(b) Approval of other containers. The appropriate TTB officer may approve the use of another type of container for a particular purpose in place of a type of container specifically authorized in this part for that purpose if the use of that container:
(1) Will provide protection to the revenue equal to or greater than that provided by the authorized container; and
(2) Will not hinder the effective administration of this part.
(c) Approval of other container materials. The appropriate TTB officer may approve the use of a container made of a material other than one prescribed in this subpart if the prescribed material is unsuitable for the intended purpose. If the appropriate TTB officer approves another material for a container, the approval may also specify how the container must be constructed, protected, marked, and used.