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Domestic shipments typically involve shorter transit times and fewer handling points. International shipments can pass through multiple ports, long sea voyages, temperature swings, and repeated loading/unloading - all of which put far more stress on packaging than most domestic shipments ever see.
Corrugated boxes need to be rated for the weight and stacking height they'll face in a container. For wooden pallets and crates, ISPM 15 fumigation/heat-treatment certification is required by most countries to prevent the spread of pests - uncertified wood packaging is one of the most common causes of customs rejection.
Sea freight containers can see significant temperature and humidity swings over a multi-week voyage. Desiccants, moisture-barrier bags, and proper palletizing (keeping cargo off the container floor) prevent condensation damage - a frequently underestimated cause of claims.
For a new product or a new shipping lane, consider running a smaller test shipment first to confirm your packaging holds up under real transit conditions before committing to a full container load.
