The remains need to be carefully filtered to ensure that they are all small bodies ready for cremation. First, they will be put in a box, which can be a simple cardboard box or a wooden coffin. Most coffin manufacturers will provide a coffin specially used for cremation. In addition, you can also choose a wooden coffin with a built-in carton, which looks the same as a traditional coffin. After the funeral, the inner box will be taken out of the coffin and cremated, so that the coffin shell can be reused. In addition, the funeral home also provides coffin rental services. They will use traditional coffins at funerals and then move them to another box for cremation. The rented coffins are sometimes designed with movable bedplates and linings, so they can be replaced after each use.

In Britain, the body will not be taken out of the coffin as mentioned above and then cremated in another box. Their bodies will be cremated with coffins, so coffins in Britain must be made of combustible materials. Its Code of Practice for Cremation stipulates that once the coffin arrives at the crematorium, it cannot be opened again, and stipulates that the cremation ceremony must be held on the same day as the funeral ceremony. Therefore, if cremated in Britain, the bodies will be placed in the same coffin from the beginning of the funeral to the completion of cremation. Also, because the coffin can't be opened after it arrives at the crematorium, the family members must take all the jewelry from the deceased before the coffin is closed. After the cremation process is completed, the remaining process is to remove the remaining small amount of metal by magnetic field, which will be buried underground near the crematorium later.

In Australia, the coffins of the cremated dead are provided by the undertaker. Reusable or cardboard coffins are not many. If the cost is considered, they will provide a flat laminated coffin called "Chippie" in the industry. Its handle (if appropriate) is made of plastic and is also approved for use in cremators. Coffins can be made of different plywood (some will be covered with velvet clothes) to stabilize the wood. Most of them are granular laminates with external decoration.