Most deceased are buried vertical instead of horizontal in Japan because of the scarcity of land. Same holds true for Korea or did when I was there in 1953-54.
My take on what I believe Ken got the question correct I came up with a never heard of coffin, see link. To be kind to my Pall Buriers(sp) I should use something light like redwood, ' >. Hope someone sneaks in some chisels for me.
Ken gets the freshly cosmolined Golden Uni for his correct answer of coffins. Coffins were shaped and built much like barrels and the coopers were employed to make coffins as well as their customary barrels. In times of battle extra coopers would be called to be on hand for coffin making.