These diagrams show funerary urns of the type that appear at the end of The Chosen. Corpses are buried in these folded into a foetal position as shown. That a Master would have far less room inside such an urn than is shown is because these urns are not made for such a large body.
Funerary urns are ‘eared’ with many handles. Some of these are used, as shown, to allow a pole to be thrust through them so that they can then be carried. Others are used to attach the ropes which keep the lids tightly closed.