A bonded warehouse is a secure area where goods imported into the U.S. can be assembled, re-labeled, re-marked, manipulated, and stored without the payment of duty for up to 5 years from the date of import.
Any cleaning, repackaging, and sorting is subject to Customs approval.
There are 11 different types of bonded warehouses.
Bonded Warehouse - CBP
Customs Bonded Warehouses - Export.gov
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