US lawFederal (United States)RegulationsTitle 49 CFR — TransportationChapter I — PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATIONPart 178 — SPECIFICATIONS FOR PACKAGINGSSubpart R — Flexible Bulk Container Standards178.100549 C.F.R. § 178.1005Flexible Bulk Container identification code.Last amended: 2016Year: 2026Length: 8 wordsOfficial source Cite as 49 C.F.R. § 178.1005 (2026)The Flexible Bulk Container code designation is BK3.Previous49 C.F.R. § 178.1000Next49 C.F.R. § 178.1010