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For example, some may offer a protective casket that uses a gasket to seal the casket shut after it is closed for the final time.
In England, it has long been law that a coffin for interment above ground should be sealed; this was traditionally implemented as a wooden outer coffin around a lead lining, around a third inner shell.
Some manufacturers offer a warranty on the structural integrity of the coffin.
However, no coffin, regardless of its construction material (e.g., metal rather than wood), whether or not it is sealed, and whether or not the deceased was embalmed beforehand, will perfectly preserve the body.
When a coffin is used to transport a deceased person, it can also be called a pall, a term that also refers to the cloth used to cover the coffin.
Certain Aboriginal Australian groups use intricately decorated tree-bark cylinders sewn with fibre and sealed with adhesive as coffins. Sometimes coffins are constructed to permanently display the corpse, as in the case of the glass-covered coffin of the Haraldskær Woman on display in the Church of Saint Nicolai in Vejle, Denmark or the glass-coffin of Vladimir Lenin which is in the Red Square in Moscow.
In Medieval Japan, round coffins were used, which resembled barrels in shape and were usually made by coopers.
In the case of a death at sea, there have been instances where trunks have been pressed into use as a coffin.
As many as 10 wooden coffins have been found from the Dawenkou culture (4100–2600 BC) site at Chengzi, Shandong.
Examples of this have been found in several Neolithic sites; the double coffin, the earliest of which was found in the Liangzhu culture (3400–2250 BC) site at Puanqiao, Zhejiang, consists of an outer and an inner coffin, while the triple coffin, with its earliest finds from the Longshan culture (3000–2000 BC) sites at Xizhufeng and Yinjiacheng in Shandong, consists of two outer and one inner coffins.
Cultures that practice burial have widely different styles of coffin.