Conversation so far:
what is the box called when you die
A coffin is a funerary box used for viewing or keeping a corpse, either for burial or cremation.
A casket is the same as a coffin?
Coffins are tapered at the head and foot and are wide at the shoulders while caskets are rectangular in shape and are usually constructed better.
Do both caskets and coffins go on display?
The traditional form-fitting coffin was deemed too morose for viewing purposes and was replaced by the four-sided, hinged-lidded, box-shaped burial vessel that is the casket.
what are more differences between caskets and coffins
Casket denotes a four-sided or eight-sided (rectangular) funerary box, while a coffin is usually six-sided or twelve-sided (elongated hexagonal) funerary box.

Question: What other vessels are there?
Self-contained rewrite: What other vessels besides coffins and caskets for human burial are there?