Is UN retesting necessary for overpack?

Randy asks:

If our customer has small cartons that have already passed UN testing individually and my customer wishes to put 10 or less of these into a larger carton, would the larger carton need to be UN tested as well or would it be considered an overpack box since the smaller cartons have already passed UN testing? If an overpack box, what information needs to be on the outside of that carton?

It appears that you are going to a combination or composite type package. Since this is a deviation from the original design qualification, the entire unit should be retested. It is best to ask this question of the specific testing facility that did the last testing validation. You can certainly make the call on behalf of your customer. Your customer and lab can provide you with the proper labeling.
— Ralph

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