49 C.F.R. § 173.245 Bulk packaging for extremely hazardous materials such as poisonous gases (Division 2.3).
Title 49 - Transportation
When §172.101 of this subchapter specifies that a hazardous material be packaged under this section, only the following bulk packagings are authorized, subject to the requirements of subparts A and B of part 173 of this subchapter and the special provisions specified in column 7 of the §172.101 table. (a) Tank car tanks and multi-unit tank car tanks, when approved by the Associate Administrator. (b) Cargo tank motor vehicles and portable tanks, when approved by the Associate Administrator. [Amdt. 173–224, 55 FR 52663, Dec. 21, 1990, as amended at 56 FR 66275, Dec. 20, 1991; 66 FR 45379, Aug. 28, 2001]
Title 49: Transportation
PART 173—SHIPPERS—GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS
Subpart F—Bulk Packaging for Hazardous Materials Other Than Class 1 and Class 7
§ 173.245 Bulk packaging for extremely hazardous materials such as poisonous gases (Division 2.3).

