Which of the following defines an outer enclosure that offers no sealing qualities?

An outer enclosure that offers no sealing qualities is defined as a grave liner. A grave liner is primarily designed to support the weight of the soil above and to define the space of the grave, but it does not provide a watertight seal. This allows for drainage while still preventing the grave from collapsing over time.

The purpose of a grave liner is to protect the casket from the earth's elements while the burial takes place, yet it does not possess the sealing characteristics that would be seen in a burial vault, which is intended to seal and protect the casket from external factors like water and soil. This distinction is important in understanding the role of different outer enclosures in funeral service and burial practices.

In contrast, other options such as a casket or a cremation container serve different functions related to the handling and presentation of the remains, while a grave box, which is often used interchangeably with grave liners, is typically designed to provide both support and some level of sealing.