The opening behind the granite faceplate is approximately 6" x 6". It is 15" deep. The container can be a box, urn or cloth bag. To fit two cremains in one niche we recommend
Boxes that are 5" x 5" x 7"
Urns that are 6" diameter x 6" tall.
Soft bags should be approximately 175 cubic inches (about 5" x 5" x 7")