It usually comes in three parts; a protective container to isolate the item and deflect damage, a container to hold it and take impact, and void filler to reduce movement.

它通常分为三个部分；用于隔离物品并转移损坏的保护性容器，用于容纳物品并承受冲击的容器，以及用于减少移动的空隙填充物。