A method of assembling a casket assembly includes folding a left end of one side panel toward a main body portion to form part of a head end of the casket assembly. The method also includes folding a right end of the side panel toward the main body portion to form part of a foot end of the casket assembly. Another side panel is folded the same way, and also forms part of both the head end and the foot end. The method includes arranging the first side panel and the second side panel within a base of the casket assembly, and removably coupling a lid of the casket assembly to the side panels.