Overpacks

An overpack is an enclosure used by a single shipper to contain one or more packages. It forms one handling unit for convenience in handling and storage. Examples of overpacks include packages strapped together, packages strapped to a pallet or skid, a wooden crate containing multiple single packages, and strong boxes or drums that contain multiple inner packages.

Each dangerous goods package within an overpack must be properly packed, marked, and labeled according to the DGR. It must also be free of any damage or leakage, and it must not impair the intended function of each package. An overpack must not contain packages containing different substances that might react dangerously with one another. Note that an overpack may contain packages of goods that are not subject to these Regulations.

Overpacks can be accepted as "Cargo Aircraft Only" when there is only one package contained in the overpack. If there is more than one package in the overpack, then it must be assembled in such a way that clear visibility and easy access to the CAO packages is possible.

Unless all markings representative of all dangerous goods in an overpack are clearly visible, the overpack must be marked with the word "Overpack," and the lettering of the marking must be at least 12 mm high.

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