The containers look to me as though they might be made of a variety of materials. They are not all drawn the same way or with the same level of ornateness.
Some possibly of wood? Some of leather? Some of metal? One looks very much like it was made from glass (the illustrator has attempted to make it look transparent).
Also, I'm not convinced all of them are containers. I think some are, but some of the shapes of the "containers" might be based on candlestick shapes and a few look more like finials than containers and were possibly inspired by the many ornate finials that adorned buildings and reliquaries at the time.
Some possibly of wood? Some of leather? Some of metal? One looks very much like it was made from glass (the illustrator has attempted to make it look transparent).
Also, I'm not convinced all of them are containers. I think some are, but some of the shapes of the "containers" might be based on candlestick shapes and a few look more like finials than containers and were possibly inspired by the many ornate finials that adorned buildings and reliquaries at the time.