What is the term for any product that serves as both a casket and a permanent burial receptacle?

The term that refers to a product serving as both a casket and a permanent burial receptacle is indeed best described as a combination unit. This designation reflects the dual purpose of the product, emphasizing that it not only functions as a casket for the funeral service but also serves as the final resting place for the deceased once buried.

By using the word "combination," it clearly indicates that the unit fulfills two essential roles in the burial process in one cohesive design, which can be beneficial for both families and funeral service providers looking for practical solutions in burial arrangements. This terminology is particularly important in the context of modern funeral practices, where options for post-death arrangements are expanding, and where clarity in terminology ensures understanding among both consumers and industry professionals.