Overpack FAQ

An enclosure that is used by a single consignor to provide protection or convenience in handling of a package or to consolidate two or more packages. 

49CFR, TDGR, IATA, and the IMDG Code 

Packages are placed on a pallet and secured by strapping, shrink wrapping, stretch wrapping, or other suitable means. 
Packages are placed in a protective outer packaging such as a box or crate. 

It is important to understand that overpacks are not a fix for packages that are non-compliant because of size, damage, or other reasons.  

All hazardous material packages contained in the overpack must be properly packed, marked, labeled, and in proper condition, as required by the regulations. They must also be packed in accordance with segregation requirements. 

Per IATA 7.1.7.1, 49CFR 173.25 (a)(4), TDG 4.10.1 (2), and IMDG Code 5.1.2.1, the “OVERPACK” marking is required when the required markings representative of each package type contained in the overpack are not visible from outside of the overpack.  The lettering on the “OVERPACK” marking must be at least 12 mm (0.5 inches) high.