Stackable incubator racks allow more samples to fit in the controlled condition apparatuses. Organizing plated specimen in a tiered rack formation, the perforated trays facilitate maximum air flow and slide easily into place. Basketlike styles prevent bottles or flasks from moving during the development processing. Capable of withstanding extreme temperatures, the supports are also autoclavable to maintain testing sterility. Incubator racks may feature label areas for accurate sample identification.