What is the purpose of the rigid material in a cremation box for short-term use?

The purpose of the rigid material in a cremation box for short-term use is to ensure it can be sealed effectively. A cremation box needs to be securely closed to maintain the integrity of the remains during the cremation process and to comply with regulatory requirements regarding the handling and transport of human remains. The use of a rigid material strengthens the box, providing a secure structure that prevents any potential leakage or compromise of the contents. This is crucial not only for the respect and dignity of the deceased but also for upholding legal standards surrounding cremation practices.

The material's rigidity contributes to the overall safety and security of the remains, making it a vital aspect of the design of a cremation box intended for short-term usage. The other options do not reflect the primary functionality that ensures the box's integrity and compliance.