Wyo. Stat. § 33-16-537: Cremation containers.

(a) A cremation container shall meet substantially all of the following standards:

(i) Be composed of readily combustible materials suitable for cremation;

(ii) Be able to be closed in order to provide a complete covering for the human remains;

(iii) Be resistant to leakage and spillage;

(iv) Be rigid enough for handling with ease; and

(v) Provide protection for the health, safety, and integrity of crematory personnel and the cremation facility.