The black fabric is a cut-off piece of hose, which was recommended as an air-permeable barrier to keep the flies in the container, which in this case had three air holes punched in the top with an ice pick. The middle container is the original plastic vial in which my mantis egg (ootheca) was delivered. The right container originally held Japanese seaweed sprinkle. I cut a whole in the plastic top and put a thin piece of sponge packing material under it.